Synthesis of 5-nitro-salicylaldehyde-N-substituted thiosemicarbazonates of copper(II): Molecular structures, spectroscopy, ESI-mass studies and antimicrobial activity
作者:Tarlok S. Lobana、Shikha Indoria、Henna Sood、Daljit S. Arora、Balwinder S. Randhawa、Isabel Garcia-Santos、Victoria A. Smolinski、Jerry P. Jasinski
DOI:10.1016/j.ica.2017.02.032
日期:2017.5
Equimolar reactions of copper(II) acetate with 5-nitro-salicylaldehyde-N-1-substituted thiosemi carbazones, [5-NO2-2-HO-C6H4-C-2(H)@ N-3-(NH)-H-2-C-1(@ S)-(NHR)-H-1; R = Me, H2L-NHMe; Et, H2L-NHEt; Ph, H2L-NHPh; H, H2L-NH2], and 4,4'-dimethyl-2,2'-bipyridine (dm-bipy), 2,9-dimethyl-1,10-phenanthroline (dm-phen) and 3,4,7,8-tetramethyl-1,10-phenanthroline (tm-phen) have yielded complexes of stoichiometry, [Cu(kappa(3)-O,N,S-5-NO2-stscN(1)HR)(kappa(2)-N, N-L')] R = H (1, 2, 3), Me (4, 5, 6), Et(7, 8, 9), Ph (10, 11, 12); L0 = dm-bipy (1, 4, 7, 10)/dm-phen (2, 5, 8, 11)/tm-phen (3, 6, 9, 12)}. They have been investigated by analytical data, infrared and electronic absorption spectroscopy, electron spin resonance spectroscopy, fluorescence activity, ESI-mass study and single crystal X-ray crystallography (1, 6, 7). The geometry of complexes is slightly distorted square pyramidal and have displayed weak to intense fluorescence in the region, 370-570 nm. Complexes have shown significant antimicrobial activity against methicillin resistant Staphylococcus aureus (MRSA), Staphylococcus aureus (MTCC740), Klebsiella pneumoniae (MTCC109), Shigella flexneri (MTCC1457), Salmonella typhimurium (MTCC-439), and Candida albicans (MTCC227). Complexes are cytotoxic against living cells and thus they are bactericidal/fungicidal. (C) 2017 Elsevier B. V. All rights reserved.