Stereochemistries of three types of bi-nuclear copper(II) chloride complexes with N-substituted salicylideneimines

Abstract

The preparation of some bi-nuclear copper(II) chloride complexes with N-substituted salicylideneimines, [ Cu( O 2. C 6 H 4.( 5X|5). C 1 H − R) Cl] 2, where R = alkyl, substituted phenyl groups and (CH 2) 3OH; and X = H, Cl, CH 3 and NO 2; and some addition compounds of these with two moles of dimethylformamide (DMF) and dimethylsulfoxide (DMSO) per one dimeric molecule are reported. Measurements of magnetic moments at room temperatures or for some of them temperature variations of magnetic susceptibilities over a temperature range 76°–320°K, reflection spectra at 2000–2340 mμ, and i.r. spectra in rock salt region were recorded for these complexes. These complexes are classified into three types of different stereochemistries based on color and reflection spectra: (1) B-type, brown in color, pseudo-tetrahedral; (2) YG-type, yellow-green, square pyramidal; and (3) Y-type yellow-orange, trigonal-bipyramidal. The empirical rule, “higher energies of d- d bands — lower magnetic moments”, was valid in the B-type complexes. For the Y-type complexes, the existence of electronegative atom or groups seems to be required.