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Abstract
Heterobimetallic complexes of the type Ni[Cu(SCN)2]2 · L (where L = acetophenone benzoylhydrazone, acetophenone isonicotinoyl hydrazone, acetophenone salicyloylhydrazone (ash), acetophenone anthraniloylhydrazone, p-hydroxy acetophenone benzoylhydrazone, p-hydroxy acetophenone isonicotinoyl hydrazone p-hydroxy acetophenone salicyloylhydrazone (phash), p-hydroxy acetophenone anthraniloyl hydrazone), were synthesized and characterized. The complexes are polymeric, insoluble in common organic solvents and are nonelectrolytes. Magnetic moments and electronic spectral studies suggest a spin-free octahedral geometry for the complexes. IR spectra show the bidentate nature of all the ligands bonding through >C=O and >C=N–groups. The SCN group acts as a bridge between two metal centers. X-ray powder diffraction parameters for Ni[Cu(SCN)2]2 · ash and Ni[Cu(SCN)2]2 · phash correspond to orthorhombic and tetrahedral crystal lattices, respectively, for these complexes. The complexes show a significant antifungal activity against Rizoctonia, Stemphylium and Aspergillus sp. and antibacterial activity against Clostridium and Pseudomonas sp. The metal complexes are more active than the ligands.
Acknowledgments
The authors thank the Director, Institute of Engineering and Technology, C.S.J.M. University Kanpur for providing laboratory facilities; the Head, Chemistry Department, Indian Institute of Technology, Kanpur for recording IR spectra, electronic spectra and X-ray diffraction patterns; and Dr Nand Lal, Institute of Life Science, C.S.J.M. University Kanpur for his help in antimicrobial screening.