Single-crystal paramagnetic susceptibilities of dichlorobis(semicarbazide)copper(II) and bis(3-azapentane-1,5-diamine)copper(II)

Abstract

The single-crystal paramagnetic susceptibilities of the title complexes have been measured in the range 20–300 K. The results are interpreted within a model which presupposes no artificially high symmetry and in which the ligand field is parameterized by the angular-overlap model. Simultaneous fitting to the reported electronic spectra helps to define bonding parameters in the semicarbazide system and is essential in the diamine complex. The angular-overlap parameters confirm the essential tetragonality of these molecules with opposite senses of distortion. σ-Bonding parameters are quite well determined but not π. A large difference between σ-bonding values for the middle and terminal N atoms of the diamine seems necessary to frt the reported spectrum.