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Abstract
Nickel(II) complexes of the Schiff base 2,3‐dimethyl‐4‐formyl‐(benzhydrazide)‐1‐phenyl‐3‐pyrazolin‐5‐one (L) with the formulae [Ni(L)2 (ClO4)]ClO4, [Ni(L)2(NO3)](NO3), and [Ni(L)2X2] (X = Cl, Br, or I) have been synthesized and characterized by elemental analyses, electrical conductance in nonaqueous solvents, infrared and electronic spectra as well as magnetic susceptibility measurements. In these complexes, L acts as a neutral bidentate ligand coordinating through the azomethine nitrogen and the carbonyl oxygen of the pyrazolone ring. In the perchlorate and nitrate complexes one of the anions is coordinated to the metal ion in a bidentate fashion while in the halide complexes both the anions are coordinated. An octahedral geometry is assigned around the nickel(II) ion in all these complexes.
Acknowledgments
We wish to express our sincere thanks to the heads of the Regional Sophisticated Instrumentation Centers at the Indian Institute of Technology, Chennai and the Indian Institute of Technology, Mumbai, for some instrumental analyses. We also thank Mahatma Gandhi University, Kerala, for providing laboratory facilities and the University Grants Commission for awarding a Teacher Fellowship to one of us (KCR) under the faculty improvement program. We also wish to express our sincere thanks to Dr. Siby Joseph and Dr. N. T. Madhu for some fruitful discussions.