Temperature dependent stereochemical transformations of distortion isomers of CuBr 2(NH 3) 2

Abstract

In the present work the influence of temparature on the deformation of the Cu(II) coordination polyhedron in the isomers of CuBr 2(NH 3) 2 was studied. At temperatures of −180, 20 and 150 °C the changes of structure were followed with the aid of electronic spectra and at −180 and 20 °C the powder diffraction patterns were taken. Although in both investigated isomers of CuBr 2(NH 3) 2 certain temperature dependent variations in the deformation of the coordination polyhedron were observed, these could not be interpreted at formation of a new isomer since the crystal structure did not change in such a manner as to lead to stabilization of a new coordination polyhedron. The results of investigation are discussed with regard to the present notions on the plasticity of the coordination polyhedron of Cu(II) complexes.