26158-47-4Relevant articles and documents
The role of methyl and benzyl substituted dithiocarbazate of 2-acetyl pyridine for the formation of bridged dimeric and unbridged monomeric copper(II) complexes and catecholase mimetic activity of the complexes
Santra, Ananyakumari,Brandao, Paula,Mondal, Gopinath,Bera, Pradip,Jana, Abhimanyu,Bhattacharyya, Indranil,Pramanik, Chandana,Bera, Pulakesh
, (2019/12/26)
Monomeric [Cu(L1)Cl] (1) and dimeric [Cu(L2)Cl]2 (2) copper(II) complexes, where HL1 = methyl-2-(1-(pyridine-2-yl)ethylidene)-hydrazine-1-carbodithioate and HL2 = benzyl-2-(1-(pyridine-2-yl)ethylidene)hydrazine-1-carbodithioate, have been synthesized and characterized by X-ray crystallography, TGA and spectral methods. Complex 1 crystallizes in a space group P21/n and adopts a square planar environment surrounding the Cu ion, and complex 2 is a triclinic crystal system with space group Pī. Complex 2 is a centrosymmetric dimer where each copper atom forms two chloro bridges and completes five coordination with the tridentate NNS donor. Density functional calculations demonstrate that chloro-unbridged structure of 1 is favored by London dispersion between its layers. It is noticed that the layers are usually packed closely in the solid phase, such attractive interactions are sterically hindered between the layers of 2. Due to the presence of large phenyl group that extend from one layer to the other, the layers cannot slide on top of each other. This leads to the chloro-bridged structure of 2 stabilized by electrostatic interactions between Cu and Cl atoms located at different layers. Both complexes exhibit prominent catecholase activity in methanol following the oxidation of 3,5-di-tert-butyl catechol (DTBC) to the corresponding quinone. Based on the observed turn over frequency of 1 (25.19 h?1) and 2 (10.76 h?1), the monomeric complex demonstrates more catechol mimetic oxidation than the dimer. A plausible mechanism of catecholase activity has been discussed.
Structural, spectroscopic, and biological aspects of S∩N donor Schiff-base ligands and their chromium(III) complexes
Shrivastava, Sumit,Fahmi, Nighat,Singh,Singh
experimental part, p. 1807 - 1819 (2010/12/19)
New chromium(III) complexes are synthesized by classical thermal and microwave (MW)-irradiated techniques. The Schiff bases 2-acetylfuran-S-benzyldithiocarbazate (L1H), 2-acetylthiophene-S-benzyldithiocarbazate (L2H), 2-acetylpyridin
Synthesis, characterization and antimicrobial studies of Sb(III) complexes of substituted thioimines
Mahajan, Karuna,Fahmi, Nighat,Singh, Ran Vir
, p. 1221 - 1225 (2008/09/20)
Some antimony complexes of a new class of substituted thioimines have been prepared by reacting Ph3Sb (III) with [l-(2-naphthyl) ethyledene] hydrazinecarbodithioic acid phenyl methyl ester (L1H), [l-(2-thienyl) ethyledene] hydrazinecarbodithioic acid phenyl methyl ester (L2H), [l-(2-pyridine) ethyledene] hydrazinecarbodithioic acid phenyl methyl ester (L3H) and [l-(2-furanyl)ethyledene] hydrazinecarbodithioic acid phenyl methyl ester (L4H), in unimolar and bimolar ratios using thermal as well as microwave method. All the new complexes have been characterized by elemental analyses, molecular weight determinations and spectral studies including electronic, IR, 1H and l3C NMR spectra. The spectral data are consistent with the tetra-coordinated and penta-coordinated environments around Sb(IIl). The bidentate ligands coordinate through the nitrogen and sulfur atoms. Free ligands and their metal complexes have been screened for their antimicrobial activity on different species of pathogenic fungi and bacteria and their biological activity is discussed briefly.
