1986-89-6Relevant articles and documents
Synthesis, X-ray structure, DFT studies, and catalytic activity of a vanadium(V) complex containing a tridentate Schiff base
Amini, Mojtaba,Arab, Ali,Soleyman, Rouhollah,Ellern, Arkady,Woo, L. Keith
, p. 3770 - 3781 (2013)
Reactions of a solution of NH4VO3 in H 2O2 and water and salicylidene benzoyl hydrazine as a tridentate Schiff base (ONO) afford a six-coordinate V(V) complex [VO(ONO)(OCH3)(CH3OH)] with a distorted octahedral configuration. The complexes [VO(ONO)(OCH3)(CH3OH)] were isolated as air-stable crystalline solids and fully characterized, including by single-crystal X-ray structure analysis. DFT calculations have been performed to understand the electronic structure of the complex. Vibrational frequencies and maximum absorption wavelengths of the complex theoretically calculated are in good agreement with experimental values. [VO(ONO)(OCH3)(CH 3OH)] shows efficient oxidation of sulfides to their corresponding sulfoxides using urea hydrogen peroxide as the oxidant at room temperature under air.
Wallace,Heimlich
, p. 1311,1317 (1968)
Polysiloxane-supported fullerene derivative as a new heterogeneous sensitiser for the selective photooxidation of sulfides to sulfoxides by 1O2
Latassa, Daniel,Enger, Olivier,Thilgen, Carlo,Habicher, Tilo,Offermanns, Heribert,Diederich, Francois
, p. 1993 - 1995 (2002)
A heterogeneous photosensitiser for the generation of singlet oxygen was synthesized by covalent attachment of a methanofullerene derivative to polysiloxane-based Deloxan DAP beads and its performance in the photooxidation of sulfides to sulfoxides was investigated. As opposed to C60 and many of its derivatives, the heterogeneous sensitiser can be readily used in protic solvents such as methanol which makes the photooxygenation highly selective, affording good to excellent yields of sulfoxides with aliphatic and benzylic sulfides. Moreover, the sensitiser is easily recovered at the end of the reaction by simple filtration.
Synthesis, x-ray studies, and catalytic activity of tridentate schiff base dioxo-molybdenum(VI)
Amini, Mojtaba,Khaksar, Mostafa,Boghaei, Davar M.,Bagherzadeh, Mojtaba,Ellern, Arkady,Keith Woo
, p. 2435 - 2444 (2014)
The reaction of a solution of MoO2(acac)2 in CH3OH and salicylidene 2-picoloyl hydrazone as a tridentate ONO donor Schiff base (ONO) afford a six-coordinated Mo(VI) complex [MoO2(ONO) (CH3OH)], with a distorted octahedral configuration. [MoO2(ONO)(CH3OH)] was isolated as an airstable crystalline solid and fully characterized by single-crystal X-ray structure analysis. [MoO2(ONO)(CH3OH)] shows reactivity in the oxidation of sulfides to their corresponding sulfoxides using urea hydrogen peroxide as the oxidant at room temperature under air.
Mo(vi) complex supported on Fe3O4 nanoparticles: magnetically separable nanocatalysts for selective oxidation of sulfides to sulfoxides
Keypour, Hasan,Balali, Masomeh,Haghdoost, Mohammad Mehdi,Bagherzadeh, Mojtaba
, p. 53349 - 53356 (2015)
A molybdenum complex, [MoO2Cl2(DMSO)2], was immobilized on amino propyl and Schiff base modified magnetic Fe3O4@SiO2 nanoparticles by covalent linkage. The resulting nanoparticles were used as efficient and recyclable catalysts for the selective oxidation of sulfides to sulfoxides using urea hydrogen peroxide as the oxidant. The complete characterization of catalysts was carried out by means of thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), X-ray photoelectron spectroscopy (XPS), elemental analysis, FT-IR and Raman microprobe techniques.
New mononuclear manganese(II) complexes with 2,4,6-tris(2-pyridyl)-1,3,5- triazine (tptz) - Selective catalyst in UHP oxidation of sulfides
Najafpour, Mohammad Mahdi,Holynska, Malgorzata,Shamkhali, Amir Nasser,Amini, Mojtaba,Kazemi, Sayed Habib,Zaynalpoor, Sasan,Mohamadi, Rahim,Bagherzadeh, Mojtaba,Lis, Tadeusz
, p. 202 - 209 (2012)
A new manganese complex of the formula [Mn(tptz)(OH2) 3](CF3SO3)2·EtOH, (1, where tptz = (2,4,6-tris(2-pyridyl)-1,3,5-triazine) is presented, exhibiting an excellent catalytic activity and selectivity in oxidation of various sulfides to the corresponding sulfoxides with UHP (urea hydrogen peroxide) as oxidant under air at room temperature. A modified preparation procedure produces another new manganese complex of the formula [Mn(tptz)(CH3COO)(OH 2)2](CF3SO3)·3H2O (2). X-ray structures of both Mn(II) complexes, properties (elemental analysis, electrochemistry, EPR, IR, Raman, and UV-Vis spectra), as well as DFT studies results are reported.
Synthesis and characterization of molybdenum complex supported on magnetic and non-magnetic supports: comparing their catalytic activity, selectivity, and reusability
Bagherzadeh, Mojtaba,Balali, Masomeh,Haghdoost, Mohammad Mehdi,Keypour, Hassan
, p. 673 - 685 (2019)
A molybdenum complex was immobilized on Schiff-base-modified magnetic and non-magnetic particles by covalent linkage. The characterizations of the obtained materials were carried out by means of TG–DTG, SEM, TEM, VSM, XPS, IR, and Raman microprobe techniques. All of them exhibited efficient activities in the oxidation of sulfides to sulfoxides by urea hydrogen peroxide oxidant. The advantages and disadvantages of these catalysts are discussed in detail. Molybdenum complex immobilized on silica bead can be recycled and recovered by simple filtration, but it demonstrated low activity in catalytic oxidation reaction. Immobilization on nano-SiO2 leads to the formation of nanocatalyst having high catalytic activity but inefficient reusability. The best results were obtained with nano-Fe3O4 magnetic support. The immobilized molybdenum complex on silica-coated magnetic nanoparticles can easily be recovered from the reaction system using an external magnet and reused several times with high yields.
Oxido-peroxido W(VI)-histidine–MgAl-layered double hydroxide composite as an efficient catalyst in sulfide oxidation
Nikkhoo, Mohammad,Amini, Mojtaba,Morteza,Farnia,Bayrami, Arshad,Bagherzadeh, Mojtaba,Gautam, Sanjeev,Chae, Keun Hwa
, (2018)
Oxido-peroxido W(VI)-histidine–MgAl-layered double hydroxide composite was prepared by using MgAl-layered double hydroxide as a host and oxido-peroxido W(VI)-histidine complex as a guest. The composite was characterized by XRD, IR, EDX,SEM and TEM techniques. This composite is tested for catalytic selective sulfoxidation reactions using hydrogen peroxide as oxidant showing good to moderate conversion along with high selectivity.
A simple and efficient procedure for oxidation of sulfides to sulfoxides by hexamethylenetetramine-bromine complex(HMTAB)
Shaabani,Teimouri,Safaei
, p. 265 - 271 (2000)
Hexamethylenetetramine-bromine has been found to be an efficient and selective reagent for the oxidation of sulfides to the corresponding sulfoxides.
Synthesis and characterization of two binuclear nickel(II) complexes of thiophenol-based "end-off" compartmental ligands and their application as catalysts for selective oxidation of sulfides
Khadir, Narjes,Amini, Mojtaba,Assoud, Abdeljalil,Bagherzadeh, Mojtaba,Boghaei, Davar M.
, p. 103 - 111 (2016)
Reaction of the binucleating S-protected ligand precursors 2-(N,N-dimethylthiocarbamato)-5-methylisophthalaldehyde di-2′-hydroxy anil (I) and 2-(N,N-dimethylthiocarbamato)-5-methylisophthalaldehyde di-2′-hydroxy 5′-methyl anil (II) with nickel(II) acetate tetrahydrate in the presence of pyrazole afforded the binuclear nickel(II) complexes [LINi2(pz)] (1) and [LIINi2(pz)] (2), respectively. The complexes have been characterized by routine physicochemical studies as well as by X-ray single crystal structure analysis. In both complexes, Ni(II) ions are doubly bridged by the thiophenolic sulfur of the pentadentate Schiff base ligand and a pyrazolate group. Efficient protocols for the oxidation of sulfides to sulfoxides with high selectivities, catalyzed by binuclear -thiophenolato - pyrazolatonickel(II) in the presence of urea hydrogen peroxide (UHP) were explored. We obtained predominantly the monooxygenated product. The resulting products are obtained in good to excellent yields within a reasonable time.
Synthesis, characterization, DFT studies and catalytic activities of manganese(ii) complex with 1,4-bis(2,2′:6,2′′-terpyridin- 4′-yl) benzene
Najafpour,Hillier,Shamkhali,Amini,Beckmann,Jagli?i?,Jagodi?,Strauch, Peter,Moghaddam, A. Nemati,Beretta,Bagherzadeh
, p. 12282 - 12288 (2012)
A new di-manganese complex with "back-to-back" 1,4-bis(2,2′:6,2′′-terpyridin-4′-yl) benzene ligation has been synthesized and characterised by a variety of techniques. The back-to-back ligation presents a novel new mononuclear manganese catalytic centre that functions as a heterogeneous catalysis for the evolution of oxygen in the presence of an exogenous oxidant. We discuss the synthesis and spectroscopic characterizations of this complex and propose a mechanism for oxygen evolution activity of the compound in the presence of oxone. The di-manganese complex also shows efficient and selective catalytic oxidation of sulfides in the presence of H2O2. Density functional theory calculations were used to assess the structural optimization of the complex and a proposed reaction pathway with oxone. The calculations show that middle benzene ring is distorted respect to both of metallic centers, and this in turn leads to negligible resonance of electrons between two sides of complex. The calculations also indicate the unpaired electron located on oxyl-ligand emphasizes the radical mechanism of water oxidation for the system.
A hexanuclear manganese(ii) complex: Synthesis, characterization and catalytic activity toward organic sulfide oxidation
Najafpour, Mohammad Mahdi,Amini, Mojtaba,Holyska, Malgorzata,Zare, Maryam,Amini, Emad
, p. 5069 - 5074 (2014)
Herein we report on the synthesis and characterization of a hexanuclear [MnII6] wheel-like assembly with naphthalene-1,8-dicarboxylate and 1,10-phenanthroline as ligands. Overall antiferromagnetic behavior of the magnetic properties is observed. The complex acts as a catalyst toward organic sulfide oxidation in the presence of H2O2 with good selectivity (98-100%). This journal is
Heterogeneous viologen catalysts for metal-free and selective oxidations
Hou, Shengtai,Chen, Nanqing,Zhang, Pengfei,Dai, Sheng
supporting information, p. 1455 - 1460 (2019/03/26)
Metal-free oxidation, a green chemistry process, has drawn significant attention from catalysis researchers. However, most oxidation processes are completed by homogeneous metal-free catalysts, whereas heterogeneous metal-free materials have been developed with limited successes. In this study, polymerized ionic networks (PINs) with N,N′-dialkyl-4,4′-bipyridinium units as heterogeneous viologen type of catalysts exhibited high efficiency in the oxidation of aromatic sulfides/alcohols to sulfoxides/aldehydes, respectively (conversion: >90%, selectivity: >95%). The catalytic performance of PINs originates from the electron-accepting ability of the viologen unit, which can reduce H2O2 into an active species. Especially, the synthesis of PIN catalysts is a one-step simple polymerization reaction between benzyl bromide and bipyridine in air. The metal-free heterogeneous feature, high selectivity, mild conditions (60 °C, 1 h), and the facile preparation of the catalyst make the current selective oxidation approach attractive.
