Spin–spin interactions in the paired binuclear cluster tetrakis[µ-chloro-diethyldithiocarbamatocopper(II)]

Abstract

The magnetic susceptibility as a function of temperature between 4.2 and 300 K has been determined for the new tetrameric complex [{CuCl(S₂CNEt₂)}₄]. On the basis of the known X-ray crystal structure, it is shown that the susceptibility can be interpreted in terms of three isotropic-exchange interactions acting between each of the four copper(II) ions. It is established that the principal effect of the interdimer exchange interaction is to lift the degeneracy of the two triplet-spin levels which characterise a pair of non-interacting dimers.