- Determination of trace uranium by resonance fluorescence method coupled with photo-catalytic technology and dual cloud point extraction
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In this paper, two kinds of salophens (Sal) with different solubilities, Sal1 and Sal2, have been respectively synthesized, and they all can combine with uranyl to form stable complexes: [UO2 2?+-Sal1] and [UO2 2?+/s
- Li, Jiekang,Li, Guirong,Han, Qian
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- Molecular cobalt salophen catalyst-integrated BiVO4 as stable and robust photoanodes for photoelectrochemical water splitting
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Photoelectrochemical (PEC) water splitting is a promising method for the conversion and storage of solar energy. A combination of catalysts with photoelectrodes is generally required for the development of active photoanodes in PEC devices. In this work,
- Liu, Yidan,Jiang, Yi,Li, Fei,Yu, Fengshou,Jiang, Wenchao,Xia, Lixin
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- Synthesis, structural features, antibacterial behaviour and theoretical investigation of two new manganese(III) Schiff base complexes
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Two discrete manganese(III) coordination compounds, [Mn(L)(OCN)]2 (1) and [Mn(L′)(H2O)2][dnba]·DMF·H2O (2) bearing in situ generated Schiff base ligands H2L [H2L = N,N′-o-phenylenebis(salic
- Paul, Pranajit,Bhowmik, Kanti R.N.,Roy, Subhadip,Deb, Dibakar,Das, Nandita,Bhattacharjee, Maitri,Dutta Purkayastha,Male, Louse,Mckee, Vickie,Pallepogu, Raghavaiah,Maiti, Debasis,Bauza, Antonio,Fontera, Antonio,Kirillov, Alexander M.
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- Studies on the stability of the anticancer-active [N,N′-bis(salicylidene)-1,2-phenylenediamine]chloridoiron(III) complex under pharmacological-like conditions
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Metal complexes of substituted N,N′-bis(salicylidene)ethylenediamine ligands are interesting metallo drugs for chemotherapy. Our lead [N,N′-bis(salicylidene)-1,2-phenylenediamine]chloridoiron(III) [Fe(III)salopheneCl] showed excellent in vitro activity ag
- El Deeb, Sami,Ma, Benjamin N.,Baecker, Daniel,Gust, Ronald
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- Synthesis, Characterization, and Biological Activity of Organotin(IV) Complexes with Schiff Bases
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The synthesized Schiff base ligands H2L1, N,N'-bis(2-hydroxybenzylidene)1,2-diaminobenzene, and H2L2, N,N'-bis(2-hydroxybenzylidene)hydrazine, reacted with Alk2SnCl2 to give organotin(IV) complexes 1–10. The products were characterized by elemental analysis, FTIR, 1H and 13C NMR, and mass spectrometry. All organotin(IV) derivatives with [O,N,O] donor ligands retained their 5-coordinated geometry in solid state and solutions. Most of synthesized complexes exhibited significant antibacterial activity. Cytotoxicity was also tested by using the brine shrimp (Artemia salina) lethality bioassay.
- Nazneen,Ali,Shahzadi,Shujah
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- Fluorescence properties of Schiff base - N,N′-bis(salicylidene) - 1,2-Phenylenediamine in presence of bile acid host
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Fluorescence properties of Schiff base - N,N′-bis(salicylidene) - 1,2-phenylenediamine (LH2) is used to study the micelles formed by aggregation of different important bile acids like cholic acid, deoxycholic acid, chenodeoxycholic acid and gly
- Roy, Nayan,Paul, Pradip C.,Singh, T. Sanjoy
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- Crystal structure, molecular docking, and treatment activity on myocarditis of a co-Schiff-base coordination polymer
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This work presents the synthesis and characterization of a dicyanamide-bridged coordination polymer {[Co2(L)2(dca)2](H2O)}n (named complex 1 hereafter) by using the N,O-donor Schiff base ligand 2-(((E
- Bai, Dong-Song,Bai, Li-Ying,Zhang, Qing-Shan,Zhao, Ming
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- Synthesis, characterization, solvatochromic behavior and crystal structures of complexes [CoIII(salophen)(thioacetamide)2]ClO 4 and [CoIII(salophen)(thiobenzamide)2]ClO 4
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Two new cobalt(III) complexes of the Schiff base N,N'-disalicylidene-1,2- phenylendiimine dianion (salophen), trans[CoIII (salophen)(ta) 2]ClO4, (ta = thioacetamide) (1) and trans-[Co III (salophen)(tb)2/s
- Salehi,Amirnasr,Mereiter
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- Thermodynamic properties of salophen schiff base + ionic liquid ([C nmIm][Br]) + dimethylformamide ternary mixtures at 298.15 K
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The densities and viscosities of ternary mixtures of N,N′- salicylidenephenylenediamine Schiff base (Salophen) + ionic liquid + N,N-dimethylformamide (DMF) have been determined at 298.15 K and at atmospheric pressure. The ionic liquids were: 1-propyl-3-me
- Shekaari, Hemayat,Bezaatpour, Abolfazl,Elhami-Kalvanagh, Rasoul
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- Simple imine linked colorimetric and fluorescent receptor for sensing Zn2+ ions in aqueous medium based on inhibition of ESIPT mechanism
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Herein, we report the highly selective binding of Zn2+ ion by the salicylaldimine based Schiff base chromogenic receptor 1 [(N,N′-bis (salicylidine)-o-phenylenediamine]. Receptor 1 senses Zn2+ ion in aqueous medium by colorimetric an
- Udhayakumari,Saravanamoorthy,Ashok,Velmathi, Sivan
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- Iron and cobalt salicylaldimine complexes as catalysts for epoxide and carbon dioxide coupling: effects of substituents on catalytic activity
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The synthesis and characterization of substituted ONNO-donor salen-type Schiff base complexes of general formula [MIII(L)Cl] (L?=?Schiff base ligand, M?=?Fe, Co) is reported. The complexes have been applied as catalysts for the coupling of carb
- Abu-Surrah, Adnan S.,Abdel-Halim, Hamzeh M.,Abu-Shehab, Hebah A. N.,Al-Ramahi, Esraa
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- Synthesis and Characterization of Cobalt(II) and Manganese(II) Schiff Base Complexes: Metal Effect on the Binding Affinity with β-Casein
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In this study, two metal Schiff base complexes (cobalt(II) and manganese(II), were synthesized and characterized by 1H-NMR and FT-IR analyses. The in vitro binding behavior of this complexes with β-Casein (β-CN) was investigated by using biophy
- Jahandari, Nafiseh,Mohseni-Shahri, Fatemeh S.,Moeinpour, Farid
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- Spectroscopy studies on Schiff base N,N′-bis(salicylidene)-1,2-phenylenediamine by NMR, infrared, Raman and DFT calculations
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N,N′-bis(salicylidene)-1,2-phenylenediamine, also known as Salophen, is a Schiff base which crystallizes in monoclinic structure and space group P21/c, with four molecules per unit cell. It has been intensely studied in last decades because of
- De Toledo,Pizani,Da Silva,Teixeira,Freire
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- A series of salen-type asymmetric dinuclear Dy(III) complexes: Site-resolved two-step magnetic relaxation process
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A series of asymmetric dinuclear dysprosium complexes, namely, [Dy2(L)2(DBM)2(H2O)]·2CH2Cl2 (2), Dy2(L)(DBM)4(H2O) (3), [Dy2(L)(BTFA)4
- Zhang, Wan-Ying,Chen, Peng,Tian, Yong-Mei,Li, Hong-Feng,Sun, Wen-Bin,Yan, Peng-Fei
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- 2,2′-[Benzene-1,2-diylbis(iminomethanediyl)]diphenol derivative bearing two amine and hydroxyl groups as fluorescent receptor for Zinc(II) ion
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A new non-natural receptor 2,2′-[benzene-1,2- diylbis(iminomethanediyl)]diphenol (4) was synthesized, and it is fluorogenic behaviour toward various metal ions were investigated. Receptor 4 exhibited pronounced fluorescence enhancement in the presence of
- Tayade, Kundan,Sahoo, Suban K.,Patil, Rahul,Singh, Narinder,Attarde, Sanjay,Kuwar, Anil
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- C-H???π interaction induced formation of microtubes with enhanced emission
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High luminescent bis(salicylaldehyde)o-phenylenediimine(salophen) microtubes with rectangular cross sections were successfully synthesized by a self-assembly method. Accompanied by the formation of microtubes, a remarkable enhanced emission was observed.
- Zhao, Cuiping,Wang, Zhongliang,Yang, Yinlong,Feng, Chao,Li, Wei,Li, Yanan,Zhang, Yuping,Bao, Feng,Xing, Yuliang,Zhang, Xiujuan,Zhang, Xiaohong
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- Cyanide Single-Molecule Magnets Exhibiting Solvent Dependent Reversible "on" and "off" Exchange Bias Behavior
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The syntheses, structures, and magnetic properties of four new complex salts, (PPN){[MnIII(salphen)(MeOH)]2[MIII(CN)6]}·7MeOH (Mn2M·7MeOH) (M = Fe, Ru, Os and Co; PPN+ = bis(triphenylphosph
- Pinkowicz, Dawid,Southerland, Heather I.,Avenda?o, Carolina,Prosvirin, Andrey,Sanders, Codi,Wernsdorfer, Wolfgang,Pedersen, Kasper S.,Dreiser, Jan,Clérac, Rodolphe,Nehrkorn, Joscha,Simeoni, Giovanna G.,Schnegg, Alexander,Holldack, Karsten,Dunbar, Kim R.
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- Syntheses and crystal structures of ruthenium-salen complexes containing triphenylphosphine ligands
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Treatment of [Ru(PPh3)3Cl2] with the Schiff base ligand H2salen in THF at reflux afforded a neutral Ru IIIsalen complex [RuIII(salen)(PPh3)Cl] (1). Interaction of [RuHCl(CO)(PPh3
- Li, Yan,Ma, Qing,Shi, Hua-Tian,Chen, Qun,Zhang, Qian-Feng
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- Spectroscopic studies and keto-enol tautomeric effect of newer schiff bases of ortho-hydroxybenzaldehyde/ naphthaldehyde with 1,2-phenylenediamine and 4-aminophenyl ether
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Hydroxyl Schiff bases derived from 1,2-phenylenediamine and 4-aminophenyl ether with o-hydroxy benzaldehyde or o-hydroxyl naphthaldehyde were used to investigate enol-imine and keto-amine tautomeric analysis. UV-visible spectra of the compounds have been
- Shah, Ambreen,Shah, Asif A.
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- Fabrication and study of optical and electrochemical properties of CdS nanoparticles and the GO-CdS nanocomposite
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CdS nanoparticles (NPs) have been successfully synthesized using the cadmium(ii)-salophen complex and anhydrous sodium thiosulfate (Na2S2O3) as a sulfur source in dimethyl sulfoxide (DMSO) via a thermal deposition approach
- Akbarzadeh, Raziyeh,Khalili, Seyede Sara,Dehghani, Hossein
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- Kinetics and mechanistic study of the reduction of Mn III by oxalate in Salophen scaffold: relevance to oxalate oxidase
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Abstract: The trans-Mn III(Salophen)(OH2)2+ and bioxalate (HOX -) in aqueous medium equilibrate rapidly to trans-Mn III(Salophen)(OH 2) (HOX) followed by the acid dissociation equilibrium to the (aqua) mono oxal
- Jena, Priyambada,Acharya, Achyuta N,Mundlapati, V Rao,Dash, Anadi C,Biswal, Himansu S
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- New heteroleptic 3D metal complexes: Synthesis, antimicrobial and solubilization parameters
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The microbial resistance to current antibiotics is increasing day by day, which in turn accelerating the development of new effective drugs. Several studies have proved the high antimicrobial potential of the interaction of several organic ligands with a variety of metal ions. In the present study, a conventional method has been adopted in the synthesis of twelve new heteroleptic complexes of cobalt (II), nickel (II), copper (II) and zinc (II) using three aldimines, namely, (HL1 ((E)-2-((4-chloro-2-hydroxybenzylidene)amino)-3,4-dimethyl-5-phenylcyclopent-2-en-1-one), HL2 ((Z)-3-((4-chlorobenzylidene)amino)-4-hydroxy-5-nitrobenzenesulfonic acid) HL3 (2,20-((1,2-phenylenebis(azaneylylidene))bis(methaneylylidene))diphenol)) as primary ligands, while phenyl glycine was the secondary ligand. The synthesized compounds were characterized by UV-vis, IR and multinuclear (1H and 13C) NMR spectroscopy, elemental analysis, and electrical conductance. The IR study revealed the coordination of the aldimine derivatives with the -OH and N atom of imine moiety. In contrary to this, the phenyl glycine coordinated to the metal ions via oxygen of carboxylate and nitrogen of the amino group. The spectroscopic analysis unveiled the tetrahedral geometry of the synthesized metal (II) complexes, except for ligand HL3 which exhibited octahedral geometry. The synthesized compounds generally showed antibacterial activity for all microbes, except Ni (II) complexes lacking sensitivity. Furthermore, to access the bioavailability, the synthesized complexes were screened for their solubilization in the micellar media of sodium lauryl sulphate. The metal complex–surfactant interaction was revealed by UV-vis spectroscopy and electrical conductivity measurements.
- Alelwani, Walla,Ali, Uzma,Alkahtani, Muneera D. F.,Alnajeebi, Afnan M.,Alshater, Heba,Babteen, Nouf Abubakr,Noor, Sadia,Raheel, Ahmad,Taj, Muhammad Babar
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- DNA interaction with Al-N,N′-bis(salicylidene)2,2′-phenylendiamine complex
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The Al(III) complex, [Al(salophen)2H2O]NO3, was synthesized and characterized by spectroscopic (NMR and FT-IR) techniques. Then the binding of Schiff base complex of [Al(salophen)]+ type, where salophen denotes N,N′-bis(sa
- Kashanian,Gholivand,Ahmadi,Taravati,Colagar, A. Hosseinzadeh
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- Fabrication of selective and sensitive Pb2+ detection by 2,2′-(?(1,2-phenylenebis(azaneylylidene))bis(methaneylylidene))diphenol by electrochemical approach for environmental remediation
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The Tetradentate Schiff base was easily prepared from o-phenylenediamine and salicylaldehyde and used as a ligand for the detection of heavy metal ions in phosphate buffer medium by electrochemical approach. To fabricate the selective lead (Pb2+/sup
- Aqlan, Faisal M.,Alam,Asiri, Abdullah M.,Zayed, Mohie E.M.,Al-Eryani, Dyab A.,Al-Zahrani, Fatimah A.M.,El-Shishtawy, Reda M.,Uddin, Jamal,Rahman, Mohammed M.
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- Efficient red electroluminescent devices with sterically hindered phosphorescent platinum(II) Schiff base complexes and iridium complex codopant
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Sterically hindered platinum(II) Schiff base complexes were prepared. Complex 4, which displays red emission with a quantum yield of 0.29 in a thin film and a self-quenching rate constant of 1×10-7 dm3 mol-1 s-1
- Kwong, Chun-Lam,Kwok, Chi-Chung,Cheng, Gang,Che, Chi-Ming,Zhou, Liang,Zhang, Hongjie
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- Kinetics and mechanism of the redox reaction of N,N′-phenylenebis-(salicylideneiminato)iron(III) with oxalic acid in mixed aqueous medium
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The kinetics of electron transfer between N,N′-phenylenebis-(salicylideneiminato)iron(III), hereafter referred to as [Fe(Salphen)]+, and oxalic acid was studied in mixed aqueous medium (DMSO:H2O; 1:4 v/v) under pseudo-first-order con
- Ibrahim,Idris,Abdulkadir,Onu
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- Salicylate-selective electrodes based on Al(III) and Sn(IV) salophens
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New salicylate-selective electrodes based on aluminum(III) and tin(IV) salophens are described. The electrodes were prepared by incorporating the ionophores into plasticized poly(vinyl chloride) (PVC) membranes, which were directly coated on the surface of graphite electrodes. These novel electrodes display high selectivity for salicylate with respect to many common inorganic and organic anions. The influence of membrane composition and pH and the effect of lipophilic cationic and anionic additives on the response properties of the electrodes were investigated. The electrode based on- aluminum salophen, with 32% PVC, 65.8% plasticizer, and 2.2% ionophore, shows the best potentiometric response characteristics and displays a linear log [Sal-] vs EMF response over the concentration range 1 x 10-6-1 x 10-1 M in phosphate buffer solutions of pH 7.0, with a Nernstian slope of -59.2 mV/decade of salicylate concentration. Highest selectivity was observed for the membrane incorporating 38.8% PVC, 57.3% plasticizer, 2.6% Sn(salophen), and 1.3% sodium tetraphenylborate. The electrodes exhibit fast response times and micromolar detection limits (~1 x 10-6 M salicylate) and could be used over a wide pH range of 3-8. Applications of the electrodes for determination of salicylate in pharmaceutical preparations and biological samples are reported.
- Shahrokhian, Said,Amini, Mohammad K.,Kia, Reza,Tangestaninejad, Shahram
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- Fluorescent chemosensor based on sensitive Schiff base for selective detection of Zn2+
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A Schiff-base fluorescent compound - N, N'-bis(salicylidene)-1,2 - phenylenediamine (LH2) was synthesized and evaluated as a chemoselective Zn2+ sensor. Addition of Zn2+ to ethanol solution of LH2 resulted in a
- Singh, T. Sanjoy,Paul, Pradip C.,Pramanik, Harun A.R.
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- Gallium(III)-Salophen as a Dual Inhibitor of Pseudomonas aeruginosa Heme Sensing and Iron Acquisition
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Pseudomonas aeruginosa is an opportunistic bacterium that causes life-Threatening infections in immunocompromised patients. In infection, it uses heme as a primary iron source and senses the availability of exogenous heme through the heme assimilation sys
- Ai, Yong,Centola, Garrick,Dent, Alecia T.,Deredge, Daniel J.,Hom, Kellie,Wilks, Angela,Xue, Fengtian
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- An unsymmetrical coordination environment leading to two slow relaxation modes in a Dy2 single-molecule magnet
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A Dy2 single-molecule magnet was isolated using a mixed ligand strategy in which the DyIII ions adopt distinct coordination environments. This leads to two unique relaxation modes due to a single-ion type relaxation mechanism. Energy
- Lin, Po-Heng,Sun, Wen-Bin,Yu, Mang-Fei,Li, Guang-Ming,Yan, Peng-Fei,Murugesu, Muralee
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- Coordination ability of free or silica immobilized Schiff bases towards Hg(II), Cd(II) and Pb(II) ions
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A series of ligands, consisting of Schiff bases and their reduced amine derivatives, was prepared by [2+1] condensation of 3-methoxy (or 3-ethoxy)-2-hydroxybenzaldehyde or 2-hydroxybenzaldehyde with 3,4-diaminobenzoic acid or 1,2-diaminobenzene, and by su
- Magro, Andrea,Crociani, Laura,Prinzivalli, Cristina,Vigato, Pietro Alessandro,Zanonato, Pier Luigi,Tamburini, Sergio
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- Fluoride-triggered ESPT in the binding with sal(oph)en
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In this paper, anion binding and sensing affinity of the simple and easy-to-make salen, a typical class of ligand used comprehensively in metal coordination, was investigated. Results indicated that salophen was both a colorimetric and fluorescent selecti
- Liu, Kai,Huo, Jianzhong,Zhu, Bolin,Huo, Ran
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- Simple and rapid spectrophotometric determination of trace level chromium using bis (salicylaldehyde) orthophenylenediamine in nonionic micellar media
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Bis(salicylaldehyde)orthophenylenediamine (BSOPD) has been proposed as new analytical reagent for the direct spectrophotometric determination of chromium. It reacts with chromium(VI) in slightly acidic (0.1 - 0.3 M H2 SO4) micellar m
- Soomro, Rubina,Ahmed, M. Jamaluddin,Memon, Najma
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- Crystal structure and theoretical studies of the keto-enol isomerism of N,N′-bis(salicylidene)-o-phenylenediamine (salophen)
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The Schiff base N,N′-bis(salicylidene)-o-phenylenediamine (salophen) was prepared by the condensation of salicylaldehyde with o-phenylenediamine in ethanol solution. The compound was characterized by elemental analysis, infrared (IR), 1H,
- Mota, Vinicius Z.,De Carvalho, Gustavo S.G.,Corbi, Pedro P.,Bergamini, Fernando R.G.,Formiga, André L.B.,Diniz, Renata,Freitas, Maria C.R.,Da Silva, Adilson D.,Cuin, Alexandre
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- Chemoselective reduction of nitroaromatics using recyclable alumina-supported nickel nanoparticles in aqueous medium—exploration to one pot synthesis of benzimidazoles
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An economical and eco-compatible synthetic protocol for chemoselective and regioselective reduction of nitroaromatics in water has been achieved using easily accessible alumina-supported nickel nanoparticles as a stable recyclable heterogeneous catalyst. Various sensitive substituents like allyloxy, benzyloxy, t-butyldimethylsilyloxy, hydroxymethyl, alkoxycarbonyl, formyl, keto, carboxylic acid, chloro, bromo, azo and cyano were tolerated in the aforesaid protocol. This method has been extended for the construction of imidazole derivatives through one-pot reductive condensation of 2-nitroaniline with diversely substituted benzaldehydes. Some of the synthesized imidazoles have been used as antibacterial, antiplatelet and antithrombotic agents.
- Ghatak, Avishek,Bhar, Sanjay
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supporting information
p. 368 - 379
(2022/02/05)
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- Neodymium (III) and Samarium (III) Complexes of 2, 2′-((1E, 1′E)-(1, 2-phenylene bis(Azanlylidene)bis(Methanylylidene)) diphenol ligand: Synthesis, characterization and biological activity
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Complexes of Nd(III) and Sm(III) of a Schiff base ligand derived from the condensation of o-phenylenediamie and 2-hydroxybenzaldehyde were synthesised and characterised by various analytical and spectroscopic techniques. The analytical values revealed a m
- Johnson, Atim Sunday,Ukoha, Pius Oziri,Ukpong, Emmanuel Jimmy,Uwanta, Emaime Jimmy
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p. 575 - 582
(2021/07/10)
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- Synergistic effect of copper nanocrystals-nanoparticles incorporated in a porous organic polymer for the Ullmann C-O coupling r–eaction
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A quinoxaline-based porous organic polymer (Q-POP) as a mesoporous organic copolymer was developed as a new platform for the immobilization of CuNPs and copper nanocrystals. The prepared materials were characterized by FT-IR, XRD, N2 adsorption-desorption isotherms, ICP, TGA, SEM, HR-TEM, EDX, and single-crystal X-ray crystallography. The obtained catalyst presented extraordinary catalytic activity towards Ullmann C–O coupling reactions with high surface area, hierarchical porosity, and excellent thermal and chemical stability. Due to its high porosity, and synergistic effect of copper nanocrystals incorporated in the polymer composite, the as-synthesized catalyst was successfully utilized for the Ullmann C–O coupling reaction of phenols and different aryl halides to prepare various diaryl ether derivatives. All types of aryl halides (except aryl fluorides) were screened in the Ullmann C–O coupling reaction with phenols to produce diaryl ethers in good to excellent yields (70–97 %), and it was found that aryl iodides have the best results. Besides, due to the strong interactions between CuNPs, N, and O-atoms of quinoxaline moiety existing in the polymeric framework, the copper leaching from the support was not observed. Furthermore, the catalyst was recycled and reused for five consecutive runs without significant activity loss.
- Gorginpour, Forough,Zali-Boeini, Hassan
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- DNA Binding and DNA Cleavage Activities of Newly Synthesized CoIIand CuIIComplexes of a β-Cyclodextrin Based Azo-Functionalized Schiff Base
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Two water soluble complexes with CoII and CuII ions were synthesized using a novel β-cyclodextrin based azo-functionalized Schiff base as a ligand. The Schiff base and its metal complexes were characterized by different physico-chemical and spectroscopic
- Das, Ananya,Mishra, Dipu Kumar,Gurung, Pritika,Dakua, Vikas Kumar,Sinha, Biswajit
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p. 341 - 350
(2021/02/01)
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- Efficient catalytic reduction of 4-nitrophenol using copper(Ii) complexes with n,o-chelating schiff base ligands
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The reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride was used as a model to test the catalytic activity of copper(II) complexes containing N,O-chelating Schiff base ligands. In this study, a series of copper(II) complexes containing respective Schiff base ligands, N′-salicylidene-2-aminophenol (1), N′-salicylidene-2-aminothiazole (2), and N,N′-bis(salicylidene)-o-phenylenediamine (3), were synthesized and characterized by elemental analysis, Fourier transform infrared (FT-IR), and UV-Visible (UV-Vis) and electron paramagnetic resonance (EPR) spectroscopies. The results from the 4-nitrophenol reduction showed that 3 has the highest catalytic activities with 97.5% conversion, followed by 2 and 1 with 95.2% and 90.8% conversions, respectively. The optimiza-tion of the catalyst amount revealed that 1.0 mol% of the catalyst was the most optimized amount with the highest conversion compared to the other doses, 0.5 mol% and 1.5 mol%. Recyclability and reproducibility tests confirmed that all three complexes were active, efficient, and possess excellent reproducibility with consistent catalytic performances and could be used again without a major decrease in the catalytic activity.
- Abdullahi, Muhammad Sabiu,Endot, Nor Azam,Garba, Hassan Wafi,Jamil, Mohamad Shazwan Shah
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- Natural dolomitic limestone-catalyzed synthesis of benzimidazoles, dihydropyrimidinones, and highly substituted pyridines under ultrasound irradiation
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Natural dolomitic limestone (NDL) is employed as a heterogeneous green catalyst for the synthesis of medicinally valuable benzimidazoles, dihydropyrimidinones, and highly functionalized pyridines via C–N, C–C, and C–S bond formations in a mixture of ethan
- Godugu, Kumar,Gundala, Trivikram Reddy,Mohinuddin Pinjari, Mohammad Khaja,Reddy Nallagondu, Chinna Gangi,Sanapareddy, Lakshmi Reddy,Sri Yadala, Venkata Divya
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supporting information
p. 1881 - 1900
(2020/10/02)
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- Ultra-small cobalt nanoparticles from molecularly-defined Co-salen complexes for catalytic synthesis of amines
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We report the synthesis of in situ generated cobalt nanoparticles from molecularly defined complexes as efficient and selective catalysts for reductive amination reactions. In the presence of ammonia and hydrogen, cobalt-salen complexes such as cobalt(ii)-N,N′-bis(salicylidene)-1,2-phenylenediamine produce ultra-small (2-4 nm) cobalt-nanoparticles embedded in a carbon-nitrogen framework. The resulting materials constitute stable, reusable and magnetically separable catalysts, which enable the synthesis of linear and branched benzylic, heterocyclic and aliphatic primary amines from carbonyl compounds and ammonia. The isolated nanoparticles also represent excellent catalysts for the synthesis of primary, secondary as well as tertiary amines including biologically relevant N-methyl amines.
- Beller, Matthias,Chandrashekhar, Vishwas G.,Gawande, Manoj B.,Jagadeesh, Rajenahally V.,Kalevaru, Narayana V.,Kamer, Paul C. J.,Senthamarai, Thirusangumurugan,Zbo?il, Radek
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p. 2973 - 2981
(2020/03/27)
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- Facile synthesis, solublization studies and anti-inflammatory activity of amorphous zinc(Ii) centered aldimine complexes
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In this study, Zn(II) centered complexes with aldimine derivatives were synthesized using green solvent, polyethylene glycol (PEG-400) and amorphous complexes were characterized by FT-IR, multinuclear (1H and13C NMR), elemental and thermal analysis. Thermogravimetric analysis indicated the extended thermal stability of the synthesized complexes. All the Zn(II) complexes show very significant photoexcitation in the range of 318 – 384 nm and photoemission in the range of 502 – 562 nm. Among all the complexes, Zn(II) complex (3Zn) showed minimum band gap value, 2.35 eV. These amorphous complexes have been reported for their wide applications in biomedical sciences. The synthesized aldimine ligands and Zn(II) complexes were investigated for anti-inflammatory activity and these complexes showed more anti-inflammatory potential than the corresponding aldimine ligands. The solubilization of zinc complexes in sodium dodecyl sulphate was also investigated to reveal the interaction of metal complexes by using UV-Visible spectroscopy and electrical conductivity measurements.
- Ali, Uzma,Alshater, Heba,Imran, Muhammad,Maalik, Aneela,Noor, Sadia,Qureshi, Ahmad Kaleem,Raheel, Ahmad,Sharif, Muhammad,Taj, Muhammad Babar,Tirmizi, Syed Ahmad
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p. 929 - 941
(2021/06/26)
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- Preparation method of phenylenediamine (by machine translation)
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The preparation method comprises the following steps: in the presence of an organic solvent and a catalyst, taking dihalobenzene as a raw material, ammonia water as an ammonia solution, heating ammonolysis reaction under a low pressure of no more than 0.2 mpa to prepare phenylenediamine, wherein the complex metal ion is selected from Pd. 2 + Ni-Zn-Ni alloy2 + Ni, Co2 + Fe-Fe-B2 + Or Cu2 + At least one of the. In addition, the reaction process avoids the use of a mixed acid compound harmful to the environment, is green and environment-friendly, can be recycled, reduces the production cost and is beneficial to large-scale preparation. (by machine translation)
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- Stannous chloride catalyzed synthesis of Schiff bases from hydroxybenzaldehydes and determination of their antioxidant activity by ABTS and DPPH assay
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Abstract: Phenolic compounds play a very important role in human life because of their antioxidant activity which can prevent harmful diseases caused by free radicals. In the present work, we have synthesized some Schiff bases by the reaction of different
- Bora, Gyanashree,Gogoi, Dipankoj,Saikia, Subhasmita,Pareek, Archana,Handique, Jyotirekha G
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- Design, synthesis and biological evaluation of cobalt(II)-Schiff base complexes as ATP-noncompetitive MEK1 inhibitors
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In this report, we designed and synthesized a series of cobalt(II)-Schiff base complexes (CoSBC) with competent MEK1 (mitogen-activated protein kinase kinase?1) inhibitory activity. Based on our previous report, the CoSBC exhibited high binding affinity with MEK1 protein. To further explore metal complexes as MEK1 inhibitors, a series of transition metals and ligands were employed to build a library of various metal Schiff base complexes. The MEK inhibition assays revealed that only CoSBC exhibited obvious inhibitory activity, complex 2b showed the best inhibition both in BRaf (B-rapidly accelerated fibrosarcoma)/MEK1 and MEK1/ERK2 (extracellular signal-regulated kinases-2) cascading (IC50 is 1.988 ± 0.14 μM and 1.589 ± 0.054 μM respectively). In addition, homogeneous time-resolved fluorescence test method was used to prove that CoSBC as ATP-noncompetitive MEK1 inhibitor. MEK kinase selectivity assay indicated that CoSBC can selectively inhibit MEK1/2 kinases rather than other MAPKs (mitogen-activated protein kinases) family kinases. Moreover, the interaction mode of 2b with MEK1 protein has been demonstrated by computer aided drug design.
- Li, Hongyue,Xi, Dandan,Niu, Yan,Wang, Chao,Xu, Fengrong,Liang, Lei,Xu, Ping
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p. 174 - 181
(2019/04/08)
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- Drier for water-based coating and preparation method of drier
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The invention discloses a drier for a water-based coating. The drier for the water-based coating has a structural formula shown in the description, wherein R1 is shown in the description, and R2 is Mnor Co. The preparation method comprises the following s
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Paragraph 0028; 0030; 0032; 0034; 0044; 0046
(2019/10/01)
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- Homogeneous photochemical water oxidation with metal salophen complexes in neutral media
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The development of water oxidation catalysts based on Earth-abundant metals that can function at neutral pH remains a basic chemical challenge. Here, we report that salophen complexes with Ni(ii), Cu(ii), and Mn(ii) can catalyse photochemical water oxidat
- Asraf, Md. Ali,Ezugwu, Chizoba I.,Zakaria,Verpoort, Francis
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p. 2782 - 2791
(2019/11/14)
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- A simple and efficient mechanochemical route for the synthesis of salophen ligands and of the corresponding Zn, Ni, and Pd complexes
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A number of salophen ligands and their Zn, Ni, and Pd complexes were synthesized by an efficient one-pot mechanosynthesis protocol. The reaction products were characterized by means of complementary solid-state techniques, i.e., powder X-ray diffraction,
- Leoni, Luca,Carletta, Andrea,Fusaro, Luca,Dubois, Jean,Tumanov, Nikolay A.,Aprile, Carmela,Wouters, Johan,Cort, Antonella Dalla
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supporting information
(2019/07/04)
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- Efficient Triplet-Triplet Annihilation Upconversion with an Anti-Stokes Shift of 1.08 eV Achieved by Chemically Tuning Sensitizers
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A series of Pt(II)-Schiff base complexes were synthesized as triplet sensitizers for the purpose of tuning the singlet and triplet energy levels so as to minimize energy loss during triplet-triplet annihilation (TTA) upconversion (UC). A deep-red to blue TTA-UC was achieved with an unprecedentedly large anti-Stokes shift of 1.08 eV. UC quantum yields of up to 21% (with a theoretical maximum efficiency of 50%) were observed in solution. The complexes also showed efficient UC emission in air-saturated hydrogels with a UC quantum yield up to 14.8%, which is much higher than the highest previously reported value. The low threshold excitation intensity provided by the present system offers promising potential for application in terrestrial solar energy conversion.
- Fan, Chunying,Wei, Lingling,Niu, Tong,Rao, Ming,Cheng, Guo,Chruma, Jason J.,Wu, Wanhua,Yang, Cheng
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supporting information
p. 15070 - 15077
(2019/10/22)
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- Iridium(I) homobinuclear complexes containing salen-type ligands as bridge
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New binuclear iridium(I) complexes with general formula [Ir2(η4-cod)2(μ-SB)] (1–12) derived from the reactions of tetradentate Schiff bases ligands [N,N′-ethylenebis(5-R-salicylideneimine)] (5,5′-R-salenH2), [N,N′-1,3-propylenebis(5-R-salicylideneimine)] (5,5′-R-salpenH2), and [N,N′-o-phenylenebis(5-R-salicylideneimine)] (5,5′-R-salphenH2) (R = H, MeO, Cl, NO2) with [Ir(cod)(μ-Cl)]2 were synthesized. The homobinuclear nature of this iridium complexes was supported by elemental analysis, FAB-Mass and 1H NMR spectrometry. Full characterization was accomplished by IR spectroscopy, 13C NMR and bidimensional NMR experiments (COSY, HSQC, HMBC and NOESY). In addition, iridium complex [(Ir(η4-cod)2(μ-5,5′-MeO-salen)] (2) was characterized by X-ray crystallography, showing that ethylene bridge is a s-trans conformation, and that the Schiff base ligand act as a bridging N,O-bidentate ligand toward two iridium atoms, and 1,5-cyclooctadiene (cod) ligand complete the coordination sphere of metal center. The effect of the substituent groups on salicylaldiminate fragments has been studied by 13C{1H} NMR shift and Hammett sigma correlations for each series of complexes.
- Alvarado-Monzón, José C.,López, Jorge A.,de Riquer, Gabriel A. Andreu,Cristobal, Crispin,Flores-Alamo, Marcos,Ruiz-Azuara, Lena
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p. 243 - 250
(2019/02/01)
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- The functionality of the hybrid systems driven by molecular dimension of the guest copper Schiff-base complexes entrapped in Zeolite-Y
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On encapsulation inside the supercage of zeolite-Y planar Cu (II)–Schiff base complexes show the modified structural, optical and functional properties. The electronic effect of the different substituent groups present in the catalyst plays the decisive r
- Kumari, Susheela,Choudhary, Archana,Ray, Saumi
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- Fe3O4@SiO2@Im[Cl]Mn(III)-complex as a highly efficient magnetically recoverable nanocatalyst for selective oxidation of alcohol to imine and oxime
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An efficient and environmentally friendly oxidation process for the one-pot preparation of oxime, imine and carbonyl compounds through alcohol oxidation in the presence of H2O2 and/or O2 have been developed by a melamine-Mn(III) Schiff base complex supported on Fe3O4@SiO2–Cl nanoparticles, named as Fe3O4@SiO2@Im[Cl]Mn(III)-complex nanocomposite, at room temperature. Direct oxidation of alcohol to carboxylic acid was performed using the catalyst in the presence of molecular O2 at room temperature in a different approach. The oxidation products were obtained with excellent yields and high TOFs. The properties of the catalyst were characterized by Fourier transform infrared spectroscopy (FTIR), elemental analysis (C, H, N), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), dynamic light scattering (DLS), energy dispersive X-ray analysis (EDX), X-ray photoelectron spectroscopy (XPS), inductive coupled plasma (ICP), cyclic voltammetry (CV), nuclear magnetic resonance (1H & 13C NMR), vibration sample magnetometer (VSM), Brunauer– Emmett–Teller (BET) and differential pulse voltammetry (DPV) analyses. The mechanism of the oxidation processes was investigated for the both H2O2 and O2 oxidants. The role of the imidazolium moiety in the catalyst as a secondary functionality was investigated. Chemoselectivity behavior of the catalyst was studied by some combinations. The catalyst could be recycled from the reaction mixture by a simple external magnet and reused for several times without any considerable reactivity loss.
- Kazemnejadi, Milad,Alavi, Seyyedeh Ameneh,Rezazadeh, Zinat,Nasseri, Mohammad Ali,Allahresani, Ali,Esmaeilpour, Mohsen
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p. 230 - 249
(2019/03/28)
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- Synthesis and antibacterial studies of some reduced schiff base derivatives
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A series of N,N-substituted ethylene-1,2-diamine derivatives have been prepared from reaction of 2-hydroxybenzaldehyde derivatives and 1,2-diamine derivatives in the presence of NaBH4 through Schiff base intermediate. The synthesized compounds were screened for their antibacterial activities. Compound SB01, SB02 and SB09 displayed significant activity at MIC ranges from 0.40-6.25 μg/mL.
- Patil, Udaysinha,Khan, Asif,Nagarsekar, Aarti,Mandewale, Mustapha,Yamgar, Ramesh
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p. 2796 - 2805
(2019/01/05)
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- [VIVO]2+ complexes: Structure, unusual magnetic properties and cytotoxic effect
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The present investigation was carried out with the aim of synthesizing and characterizing five vanadium coordination compounds (6–10) with different Schiff bases (1 = N,N′-bis(salicylidene)-o-phenylenediamine, 2 = N,N′-bis(4-hydroxysalicylidene)-o-phenyle
- Hernández-Benítez, L. Joshua,Jiménez-Cruz, Pamela,Cure?o-Hernández, Karla E.,Solano-Peralta, Alejandro,Flores-álamo, Marcos,Flores-Parra, Angelina,Gracia-Mora, Isabel,Castillo-Blum, Silvia E.
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p. 197 - 206
(2018/06/01)
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- Air-Stable Cobalt(II) and Nickel(II) Complexes with Schiff Base Ligand for Catalyzing Suzuki–Miyaura Cross-Coupling Reaction
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The Co(II) complex [Co{C6H4–1,2-(N=CH–C6H4O)2}] (I) and Ni(II) complex [Ni{C6H4–1,2-(N=CH–C6H4O)2}] (II) with Schiff base of o-phenylenediamine and salicylaldehyde have been synthesized. The structure of the ligand and its complexes were derived on the basis of various techniques such as elemental analysis, mass, FT-IR, electronic spectra and magnetic susceptibility. From the Singal crystal X-ray diffraction (SCXRD) analysis techniques (CIF file CCDC no. 1498772 (II)), it has been confirmed that the Schiff base ligand (L), coordinates to the metal ion in a tetradentate fashion through the nitrogen and oxygen atom. In addition, the square planar geometry of Ni(II) complex also has been confirmed from SCXRD. Electronic spectra, mass spectra, and magnetic susceptibility measurements reveal square planar geometry for the Co(II) complex. Synthesized complexes were used in cross-coupling of arylhalides with phenylboronic acid. The transformation offers products in good yields using 0.02 mmol catalysts loading, thereby proving the efficiency of the complexes as catalysts for Suzuki–Miyaura reaction.
- Ansari,Kumar,Bhat
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- Syntheses, structures and catalytic properties of ruthenium(II) nitrosyl complexes with bidentate and tetradentate Schiff base ligands
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Treatment of Ru(NO)Cl3·xH2O with 1 equiv. bidentate Schiff bases in the presence of triethylamine in DMF/THF afforded a series of anionic ruthenium(II) nitrosyl complexes of the type [Et3NH][Ru(κ2-N,O-LR)(NO)Cl3] (HLR = 2-butyliminomethyl-phenol 1, 2-(benzylimino-methyl)-phenol 2, 2-[(4-chloro-phenylimino)-methyl]-phenol 3, 2-[(4-nitro-phenylimino)-methyl]-phenol 4, 2-[(2,6-diisopropyl-phenylimino)-methyl]-phenol 5). Interaction of Ru(NO)Cl3·xH2O and 1 equiv. tetradentate Schiff bases under the same condition led to isolation of an anionic complex [Et3NH][Ru(κ2-N,O-L-CH2CH2-NOH)-(NO)Cl3] (HL-CH2CH2-NOH = N,N′-disalicylidene-1,2-ethanediamine 6) and a neutral complex [Ru(salen-phn)(NO)Cl] (H2salen-phn = N,N′-disalicylidene-1,2-phenyldiamine 7). The molecular structures of 1·?C2H5OH, 2–6, and 7·CH2Cl2 have been determined by single-crystal X-ray crystallography. Investigation of the catalytic properties of ruthenium(II) nitrosyl complexes 1–7 showed that they are efficient catalytic precursors for the transfer hydrogenation of acetophenone.
- Wu, Fule,Wang, Chang-Jiu,Lin, Hui,Jia, Ai-Quan,Zhang, Qian-Feng
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p. 718 - 723
(2017/12/26)
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- Synthesis, structure and catalytic alcohol oxidation by ruthenium(III) supported by Schiff base and triphenylphosphine ligands
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Treatment of [RuCl2(PPh3)3] with two equiv. bi-dentate Schiff base N,O-LH-Cl (N,O-LH-Cl = 2[(3-chloro-phenylimino)-methyl]-phenol) or N,O-LH-NO2 (N,O-LH-NO2 = 2[(4-nitro-phenylimino)-methyl]-phenol) in the presence of triethylamine afforded cis-[RuCl(PPh3)(κ2-N,O-L-Cl)2] (1) and trans-[RuCl(PPh3)(κ2-N,O-L-NO2)2]·Et2O (2), respectively. Reactions of [RuCl2(PPh3)3] and equal equiv. tetra-dentate Schiff bases gave corresponding ruthenium(III) complexes [RuCl(PPh3)(salen)] (3) (H2salen = N,N′-disalicylidene-1,2-ethanediamine), [RuCl(PPh3)(salipn)]·2CH2Cl2 (4) (H2salipn = N,N′-disalicylidene-1,2-(1-methyl)ethanediamine), [RuCl(PPh3)(salpn)]·CH2Cl2 (5) (H2salpn = N,N′-disalicylidene-1,2-propanediamine), [RuCl(PPh3)(salphen)]·CH2Cl2 (6) (H2salphen = N,N′-disalicylidene-1,2-phenyldiamine), [RuCl(PPh3)(saltoln)]·CH2Cl2 (7) (H2saltoln = N,N′-disalicylidene-1,2-tolyldiamine) and [RuCl(PPh3)(salcyn)] (8) (H2salcyn = N,N′-disalicylidene-(R,R)-1,2-cyclohexanediamine). The molecular structures of complexes 1–5 and 7 have been determined by single-crystal X-ray crystallography. The catalytic oxidation properties of ruthenium(III) complexes 1–8 were tested towards alcohols in the presence of N-methylmorpholine-N-oxide.
- Tang, Li-Hua,Wu, Fule,Lin, Hui,Jia, Ai-Quan,Zhang, Qian-Feng
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p. 212 - 218
(2018/04/02)
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- C-Se cross-coupling of arylboronic acids and diphenyldiselenides over non precious transition metal (Fe, Cu and Ni) complexes
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Various tetradentate and tridentate ligands such as salophane, bishydrazone, bisbenzimidazolyl pyridine and isonicotinohydrazide have been prepared. Transition metal complexes of these ligands with Cu, Ni and Fe have been further synthesized and characterized by UV–vis, IR, NMR and CHN analysis. Catalytic activity of the metal complexes was tested for the cross coupling of diarylchalcogenide with arylboronic acid in DMSO as solvent in presence of a base. These non-precious metal complexes catalysed cross coupling reactions smoothly in shorter reaction time compared to earlier reports with comparable yields.
- Sahani, Amber J.,Jayaram, Radha V.,Burange, Anand S.
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- Study the biological effect of nanosize ferric oxides prepared from low cost organic materials against human breast cancer cells
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The aim of this paper is to fully exploit the medical potential of α?Fe2O3 as a promising material for anticancer agent. Herein, Fe2O3 nanoparticles (NPs) have been synthesized using thermal decomposition method
- Hegab, Mohamed S.,El-Megharbel, Samy M.,AL-Majthoub,Adam, Abdel Majid A.,Refat, Moamen S.
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- A thin Buddha alkali double nuclear cadmium complex and its preparation method
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The present invention discloses a schiff base dinuclear cadmium complex and a preparation method therefor, and relates to the technical field of medicines. The complex is a yellow bulk crystal, the chemical name of which is N,N'-di(o-hydroxyl benzylidene)
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Paragraph 0009; 0020
(2017/08/25)
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- Monomeric and Dimeric Oxidomolybdenum(V and VI) Complexes, Cytotoxicity, and DNA Interaction Studies: Molybdenum Assisted C=N Bond Cleavage of Salophen Ligands
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Four novel dimeric bis-μ-imido bridged metal-metal bonded oxidomolybdenum(V) complexes [MoV2O2L′21-4] (1-4) (where L′1-4 are rearranged ligands formed in situ from H2L1-4/s
- Majumder, Sudarshana,Pasayat, Sagarika,Panda, Alok K.,Dash, Subhashree P.,Roy, Satabdi,Biswas, Ashis,Varma, Mokshada E.,Joshi, Bimba N.,Garribba, Eugenio,Kausar, Chahat,Patra, Samir Kumar,Kaminsky, Werner,Crochet, Aurélien,Dinda, Rupam
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p. 11190 - 11210
(2017/09/25)
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- Synthesis and catalytic application of Pd complex catalysts: Atom-efficient cross-coupling of triarylbismuthines with haloarenes and acid chlorides under mild conditions
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Palladium-catalysed cross-coupling reactions are some of the most frequently used synthetic tools for the construction of new carbon–carbon bonds in organic synthesis. In the work presented, Pd(II) complex catalysts were synthesized from palladium chloride and nitrogen donor ligands as the precursors. Infrared and 1H NMR spectroscopic analyses showed that the palladium complexes were formed in the bidentate mode to the palladium centre. The resultant Pd(II) complexes were tested as catalysts for the coupling of organobismuth(III) compounds with aryl and acid halides leading to excellent yields with high turnover frequency values. The catalysts were stable under the reaction conditions and no degradation was noticed even at 150°C for one of the catalysts. The reaction proceeds via an aryl palladium complex formed by transmetallation reaction between catalyst and Ar3Bi. The whole synthetic transformation has high atom economy as all three aryl groups attached to bismuth are efficiently transferred to the electrophilic partner.
- Jadhav,Pardeshi
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- Ligand and Metal Based Multielectron Redox Chemistry of Cobalt Supported by Tetradentate Schiff Bases
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We have investigated the influence of bound cations on the reduction of cobalt complexes of redox active ligands and explored the reactivity of reduced species with CO2. The one electron reduction of [CoII(Rsalophen)] with
- Andrez, Julie,Guidal, Valentin,Scopelliti, Rosario,Pécaut, Jacques,Gambarelli, Serge,Mazzanti, Marinella
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p. 8628 - 8638
(2017/07/06)
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- Dioxovanadium(V) complexes of Schiff and tetrahydro-Schiff bases encapsulated in zeolite-Y for the aerobic oxidation of styrene
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A series of dioxovanadium(V) complexes of Schiff and tetrahydro-Schiff bases were encapsulated into the supercages of zeolite-Y and were characterized by X-ray diffraction, SEM, N2 adsorption/desorption, FT-IR, UV-vis spectroscopy, ICPAES, pair distribution function (PDF) and X-ray absorption near edge structure (XANES) measurements. The encapsulation is achieved by a flexible ligand method in which the transition metal cations were first ion-exchanged into zeolite-Y and then complexed with ligands. The dioxovanadium-exchanged zeolite, dioxovanadium complexes encapsulated in zeolite-Y plus non-encapsulated homogeneous counterparts were all screened as catalysts for the aerobic oxidation of styrene under mild conditions. It was found that the encapsulated complexes showed better activity than their respective nonencapsulated counterparts in most cases. All encapsulated dioxovanadium tetrahydro-Schiff base complexes showed much higher activity in aerobic oxidation of styrene than their corresponding Schiff base complexes.
- Ding, Zhongzhen,Yang, Ying
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p. 290 - 299
(2017/07/25)
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- Direct preparation of oximes and Schiff bases by oxidation of primary benzylic or allylic alcohols in the presence of primary amines using Mn(III) complex of polysalicylaldehyde as an efficient and selective heterogeneous catalyst by molecular oxygen
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The present work introduced the new strategy for direct preparation of Schiff base as well as oxime compounds through oxidation of primary benzylic or allylic alcohols in the presence of amines by complexation of Mn(III) to a polymeric Schiff base ligand based on polysalicylaldehyde (PSA-Schiff base-Mn(III) complex). As a new environmentally benign protocol, manganese heterogeneous polymeric catalytic system demonstrated promising oxidation of alcohols in ethanol using molecular oxygen. PSA was synthesized through polycondensation reaction of 2-hydroxy-5-chloromethyl-benzaldehyde and then treated with 2-aminophenol to form polymeric ligand. Average molecular weight of PSA was studied by an analytical method as well as GPC analysis. Formation of the catalyst was characterized step by step by FTIR, UV–Vis, 1H NMR, TGA, CHN and EDX analyses. Loading amounts of metal ions as well as leaching amount of the catalysis were studied by ICP-OES instrument. The catalyst shows up to high yields for oxidation of primary and secondary primary benzylic or allylic alcohols to carbonyl compounds, especially direct imine formation in a mild, inexpensive and efficient method which can be successfully recovered from the reaction mixture and reused for several times without any remarkable reactivity loss. Effect of solvent, temperature, catalyst amount and oxygen donors along with some blank experiments to elucidation of catalyst activity was evaluated in this work. Also chemoselectivity behavior of the catalyst was investigated with some combinations.
- Kazemnejadi, Milad,Shakeri, Alireza,Mohammadi, Mohammad,Tabefam, Marzieh
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p. 1917 - 1933
(2017/08/15)
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- Heterogeneous catalysts hold the edge over homogeneous systems: Zeolite-Y encapsulated complexes for Baeyer-Villiger oxidation of cyclohexanone
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A series of heterogeneous catalysts [M(pamp)]-Y (Where, M = V, Mn, Fe or Cu; pamp = 2,2′-((1E,1′E)-(1,2-phenylenebis(azanylylidene))bis(methanylylidene))diphenol) was prepared by encapsulation of metal complexes within zeolite-Y. Synthesized materials were characterized by chemical, BET and thermogravimetric (TG) analysis, X-ray diffraction (XRD), UV-vis and infrared spectroscopies, and scanning electron microscopy (SEM). Zeolite-Y encapsulated complexes were tested in Baeyer-Villiger (B-V) oxidation of cyclohexanone beside neat complexes to check the aptitude of heterogeneous catalysis over the homogeneous system. The effect of experimental variables viz., solvents, catalysts amount, the mole ratio of substrate to an oxidant, temperature and reaction time on substrate conversion was also tested. Under the optimized reaction conditions, [VO(pamp)]-Y was found to be a potential candidate by providing 1500 TONs in cyclohexanone oxidation, and the selectivity towards ?-caprolactone was 85.2%.
- Mehta, Jignasu P.,Parmar, Digvijaysinh K.,Godhani, Dinesh R.,Nakum, Haresh D.,Desai, Nisheeth C.
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p. 178 - 188
(2016/07/06)
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- Cobalt salophen complexes for light-driven water oxidation
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Earth-abundant molecular complexes have been found to be excellent catalysts for the light-driven water oxidation reaction. Here, we demonstrate the photochemical water oxidation catalysed by three cobalt salophen complexes with different axial ligands in
- Asraf, Md. Ali,Younus, Hussein A.,Ezugwu, Chizoba I.,Mehta, Akshay,Verpoort, Francis
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p. 4271 - 4282
(2016/07/06)
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- Effect of the substitutional groups on the electrochemistry, kinetic of thermal decomposition and kinetic of substitution of some uranyl Schiff base complexes
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Uranyl(VI) complexes, [UO2(X-saloph)(solvent)], where saloph denotes N,N'-bis(salicylidene)-1,2-phenylenediamine and X = NO2, Cl, Me, H; were synthesized and characterized by 1H NMR, IR, UV-Vis spectroscopy, thermal gravim
- Asadi, Zahra,Nasrollahi, Rahele,Dusek, Michal,Fejfarova, Karla,Ranjkeshshorkaei, Mohammad,Firuzabadi, Fahimeh Dehghani
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p. 913 - 924
(2016/04/05)
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- Oxidation of 4-chloro-3-methylphenol using zeolite Y-encapsulated iron(III)-, nickel(II)-, and copper(II)-N,N'-disalicylidene-1, 2-phenylenediamine complexes
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The degradation of 4-chloro-3-methylphenol (PCMC) using zeolite-encapsulated iron(III), nickel(II), and copper(II) complexes of N,N'-disalicylidene-1,2-phenylenediamine as catalysts, in a heterogeneous Fenton-like advanced oxidation process, was studied.
- Hailu, Solomon Legese,Nair, Balachandran Unni,Redi-Abshiro, Mesfin,Diaz, Isabel,Aravindhan, Rathinam,Tessema, Merid
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p. 135 - 145
(2016/01/12)
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- Function of 7,7,8,8-tetracyanoquinodimethane (TCNQ) on electrocatalytic hydrogen generation catalyzed by N,N′-benzene bis(salicylideniminato)nickel(II)
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In the presence of trimethylamine, the reaction of N,N′-benzene bis(salicylidenimine) (H2L) with NiCl2·6H2O affords a nickel(II) complex, [NiL] (1), and the reaction of H2L with NiCl2·6H2O
- Xue, Dan,Lv, Qi-Ying,Lin, Chen-Neng,Zhan, Shu-Zhong
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p. 300 - 308
(2016/07/06)
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