Complexes of Copper(II) with 2,3‐Dimethyl‐4‐formyl(benzhydrazide)‐1‐phenyl‐3‐pyrazolin‐5‐one

Abstract

Copper(II) complexes of the Schiff base 2,3‐dimethyl‐4‐formyl‐(benzhydrazide)‐1‐phenyl‐3‐pyrazolin‐5‐one (L) of the general formula [Cu(L)2]X2 (X = ClO4 or NO3), [Cu(L)Cl2] and [Cu(L)2Br2] have been synthesized and characterized by elemental analyses, electrical conductance in non‐aqueous solvents, infrared, electronic and EPR spectra, as well as magnetic susceptibility measurements. In these complexes, the ligand acts as a neutral bidentate unit coordinating through the azomethine nitrogen atom and the carbonyl oxygen of the pyrazolone ring. In the perchlorate and nitrate complexes both anions remain ionic, while in the corresponding halide complexes both anions are coordinated to the metal ion. The perchlorate, nitrate and chloride complexes are of square‐planar geometry while the bromide complex is of distorted octahedral geometry.