- A series of Salen-type homodinuclear lanthanide complexes and their slow magnetic relaxation in Dy2 and Ho2
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A series of homodinuclear lanthanide complexes, namely, [Ln2(L)2(MeOH)2(NO3)2] [Ln = Gd (1), Tb (2), Dy (3), and Ho (4)], were synthesized by the reaction of Salen-type ligand, namely N, N′-bis(5-brom
- Gao, Yu,Hu, Yi-Ye,Li, Ling-Fei,Tao, Jin,Yang, Pei-Pei,Zhang, Lun
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Read Online
- Synthesis, structure, and electrochemistry and magnetic properties of a novel 1D homochiral MnIII(5-Brsalen) coordination polymer with left-handed helical character
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A novel homochiral manganese (III) Mn(5-Brsalen) coordination polymer with left-handed helical character by spontaneous resolution on crystallization by using Mn(5-Brsalen) and 4,4-bipyridine, [MnIII(5-Brsalen)(4,4-bipy)]·ClO4·CHsub
- Dong, Dapeng,Yu, Naisen,Zhao, Haiyan,Liu, Dedi,Liu, Jia,Li, Zhenghua,Liu, Dongping
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- Influences of polarizability effect of alkyl group and homoring competition effect of substituents on the NMR spectra of salen-type Schiff base
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Salen-type Schiff bases are a kind of important compounds and are widely used. In order to explore the effect of alkyl groups and substituents attached to aromatic ring on the chemical shifts, 63 title compounds were synthesized. Their 1H NMR and 13C NMR spectra were obtained; and the effects of the alkyl chain length and substituents on the chemical shifts (δH(CH=N), δC(CH=N), δH(OH), and δC(C-OH)) were studied. The results show that (1) the alkyl polarizability effect index (PEI) has an important influence on the chemical shifts of the above four atoms, with the increase of PEI, the values of δH(CH=N) and δc(CH=N) decrease, and the values of δH(OH) and δC(C-OH) increase. (2) The influence of substituent X attached to aromatic ring on the chemical shift is related to its position by taking OH or CH=N as reference. As for the effect of substituent on the chemical shifts, the effect of Hammett constant σ(X)-OH and excited-state substituent parameter (Formula presented.) with OH as reference are different from that ofσ(X)-CH=N and (Formula presented.) with CH=N as reference, and there is a “homoring competition effect” of the substituent. (3) The effect of the cross-interaction between X and OH on the chemical shift is also significantly different due to the different position of X. Quantitative correlation equations against chemical shifts were built for the four atoms, and the stability and prediction ability of the obtained equations were confirmed by leave-one-out cross validation.
- Wei, Bai-ying,Cao, Chen-zhong,Cao, Chao-tun
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p. 701 - 712
(2021/02/12)
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- Solvent-Dependent Bending Ability of Salen-Derived Organic Crystals
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The formation of plastic or brittle organic crystals of salen derivatives that depend on the solvents employed for crystallization is demonstrated. Large yellow crystals (ranging from mm to cm size) of ten different salen derivatives were obtained and inv
- Kusumoto, Sotaro,Saso, Akira,Ohmagari, Hitomi,Hasegawa, Miki,Kim, Yang,Nakamura, Masaaki,Lindoy, Leonard F.,Hayami, Shinya
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p. 1692 - 1696
(2020/07/04)
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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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- Preparation method of 3,3,3-trifluoropropylene carbonate
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The invention discloses a preparation method of 3,3,3-trifluoropropylene carbonate. The preparation method comprises the steps: with trifluoropropylene as a raw material, carrying out several simple reaction steps to obtain trifluoroepoxy propane, introducing carbon dioxide into a high-pressure reaction kettle by taking a metal conjugated microporous polymer complex as a catalyst, and preparing 3,3,3-trifluoropropylene carbonate at the temperature of 25-100 DEG C and the pressure of 0.1Mpa-3Mpa. Compared with the prior art, the method has the advantages that trifluoropropylene is taken as theraw material, so that the raw material cost is substantially lowered; and meanwhile, the yield is relatively high, and the catalyst can be repeatedly used, so that the method is suitable for industrial production.
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Paragraph 0079; 0083
(2019/03/08)
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- Experimental and theoretical structural determination, spectroscopy and electrochemistry of cobalt (III) Schiff base complexes: immobilization of complexes onto Montmorillonite-K10 nanoclay
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Abstract: The [Co(5-XSalen)(PEt3)(H2O)]ClO4 (where Salen?=?bis(salicylaldehyde)1,2-ethylenediamine and X?=?H, MeO, NO2, Br) complexes were successfully synthesized and characterized by different techniques such
- Kianfar, Ali Hossein,Tavanapour, Sanaz,Eskandari, Kiamars,Azarian, Mohammad Hossein,Mahmood, Wan Ahmad Kamil,Bagheri, Maryam
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p. 369 - 380
(2018/03/29)
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- Enhanced catalytic activity and magnetization of encapsulated nickel Schiff-base complexes in zeolite-Y: A correlation with the adopted non-planar geometry
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Square planar Ni(ii)-Schiff base complexes when encapsulated in a supercage of zeolite Y have shown altered optical, magnetic properties and catalytic activities in comparison to their corresponding free states. Different characterization techniques like
- Choudhary, Archana,Das, Bidisa,Ray, Saumi
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p. 18967 - 18976
(2016/12/09)
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- Oxovanadium(IV)-salen ion catalyzed H2O2 oxidation of tertiary amines to n-oxides- critical role of acetate ion as external axial ligand
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The oxovanadium(IV)-salen ion catalyzed H2O2 oxidation of N,N-dimethylaniline forms N-oxide as the product of the reaction. The reaction follows Michaelis-Menten kinetics and the rate of the reaction is accelerated by electron donating groups present in the substrate as well as in the salen ligand. This peculiar substituent effect is accounted for in terms of rate determining bond formation between peroxo bond of the oxidant and the N-atom of the substrate in the transition state. Trichloroacetic acid (TCA) shifts the λmax value of the oxidant to the red region and catalyzes reaction enormously. The cleavage of N£O bond by vanadium complex leads to moderate yield of the product. But the percentage yield of the product becomes excellent in the presence of TCA.
- Mathavan, Alagarsamy,Ramdass, Arumugam,Ramachandran, Mohanraj,Rajagopal, Seenivasan
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p. 315 - 326
(2015/04/14)
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- Synthesis, X-ray crystallography, thermal studies, spectroscopic and electrochemistry investigations of uranyl Schiff base complexes
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Some tetradentate salen type Schiff bases and their uranyl complexes were synthesized and characterized by UV-Vis, NMR, IR, TG, C.H.N. and X-ray crystallographic studies. From these investigations it is confirmed that a solvent molecule occupied the fifth position of the equatorial plane of the distorted pentagonal bipyramidal structure. Also, the kinetics of complex decomposition by using thermo gravimetric methods (TG) was studied. The thermal decomposition reactions are first order for the studied complexes. To examine the properties of uranyl complexes according to the substitutional groups, we have carried out the electrochemical studies. The electrochemical reactions of uranyl Schiff base complexes in acetonitrile were reversible.
- Asadi, Zahra,Shorkaei, Mohammad Ranjkesh
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p. 344 - 351
(2013/04/10)
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- Facile, efficient, and diastereoselective synthesis of heterohelicene-like molecules
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A concise and efficient route to new and interesting heterohelicene-like molecules has been developed through the one-pot, cascade reductive coupling reaction of o-hydroxydiimines or o-nitrodiimines and triphosgene in the presence of TiCl4/Sm.
- Lin, Wei,Dou, Guo-Lan,Hu, Ming-Hua,Cao, Cheng-Pao,Huang, Zhi-Bin,Shi, Da-Qing
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supporting information
p. 1238 - 1241
(2013/04/23)
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- Titanium(IV) complexes of unsymmetrical Schiff bases derived from ethylenediamine and o-hydroxyaldehyde/ketone and their anti-microbial evaluation
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The titanium(IV) complexes of the unsymmetrical Schiff base ligands (L) of ethylenediamine and salicylaldehyde, o-hydroxyacetophenone, o- hydroxynapthaldehyde have been prepared and characterized when unsymmetrical ligands are synthesized through in situ
- Uddin, Mohammad Nasir,Chowdhury,Hossain, Kamrul
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p. 1520 - 1527
(2013/04/23)
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- Redox-active tetrahydrosalen (salan) complexes of titanium
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A diarylamino-substituted N-methyl tetrahydrosalen (salan) ligand, An2NLH2, is prepared in four steps and overall 53% yield from 5-bromosalicylaldehyde, with the key step a palladium-catalysed Hartwig-Buchwald amination of the tert-b
- Quiroz-Guzman, Mauricio,Oliver, Allen G.,Loza, Andrew J.,Brown, Seth N.
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experimental part
p. 11458 - 11468
(2012/01/04)
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- Antihyperglycemic, α-glucosidase inhibitory and DPPH free radical scavenging activity of 5-bromosalicylaldehyde and schiff bases
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α-Glucosidase inhibition and DPPH free radical scavenging by 5-bromosalicylaldehyde and some Schiff bases have been measured. 5-Bromosalicylaldehyde shows lowest IC50 value (8.80 μM) for α-glucosidase inhibition and also shows good results in in vivo experiments for antihyperglycemic potential. Springer Science+Business Media, LLC 2010.
- Misra, Sristicheta,Pandeya, Krishna Bihari,Tiwari, Ashok Kumar,Ali, Amtul Zehra,Saradamani, Thimmapatruni,Agawane, Sachin Bharat,Madhusudana, Kuncha
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experimental part
p. 1431 - 1437
(2012/05/20)
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- Synthesis and antimicrobial activity of N,N′-bis(2-hydroxylbenzyl)-1, 2-ethanediamine derivatives
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A series of N,N′-Bis(2-hydroxylbenzyl)-1,2-ethanediamine derivatives and its schiff bases were synthesized, characterized and screened for in vitro antimicrobial activity against Staphylococcus aureus, Pseudomonas aeruginosa and Salmonella enterica. Resul
- Musa, Musiliyu A.,Khan, M. Omar F.,Aspedon, Arden,Cooperwood, John S.
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experimental part
p. 165 - 170
(2011/02/23)
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