Copper(II) complexes of N,N′-dibenzylethylenediamine

Abstract

The following complexes of N,N′-dibenzylethylenediamine (DBEn) of copper(II) have been prepared: CuDBEn 2Cl 2,H 2O; CuDBEn 2X 2 (X = Cl, Br, I, and NO 3); CuDBEn 2SO 4,2H 2O; CuDBEn 2(ClO 4) 2,H 2O and CuDBEnX 2 (X = Cl, Br). They have normal magnetic moments, almost invariant with temperature. From the low temperature reflectance spectra of the mono(amine) complexes, evidence for the three 2B 1g → 2A 1g; 2B 1g → 2B 2g; and 2B 1g → 2E g transitions expected for a tetragonally-distorted complex has been obtained. The coordination of anions in the tetragonal positions of the bis(amine) complexes is established from their reflectance, solution and infrared spectra, and molar conductances except for the perchlorate, which is considered to have a highly distorted, virtually planar structure. The compound CuDBEn 2Br 2 can also be obtained in a form which from its reflectance spectrum may be five-coordinate.