Abstract
Based on a tridentate thiosemicarbazone ligand {HL = 4‐(2,4‐dimethylphenyl)‐1‐((pyridin‐2‐yl)methylene)thiosemicarbazide}, the nickel complexes [NiCl(L)] 1, [Ni(L)(diEtdtc)(H2O)] 2 and [Ni(L)(pipdtc)(H2O)] 3 were prepared {NadiEtdtc = sodium diethyldithiocarbamate and Napipdtc = sodium piperidine dithiocarbamate} and their structures were elucidated according to their elemental analyses, solution conductivities, magnetic moments and spectroscopic (IR and electronic) data. X‐ray single crystal studies have confirmed the structure of 1 as a square planar complex in which each nickel atom is linked to three (two nitrogen and one sulfur) atoms from the thiosemicarbazone ligand and a chlorine atom to ensure the complex neutrality. Moreover, the asymmetric unit cell of the complex was found to consist of two independent complex molecules of slightly different conformations (A&B). The complexes, especially the binary one, displayed high bactericidal activities that, in several instances, were comparable to or higher than those of the chloramphenicol standard.
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