Collect. Czech. Chem. Commun. 1988, 53, 56-60

ESR study of the structure and bonding situation in thiocyanatocopper(II) complexes with imidazole derivatives

Anna Mašlejováa and Reinhard Kirmseb

a Department of Inorganic Chemistry Slovak Institute of Technology, 812 37 Bratislava, Czechoslovakia
b Chemistry Section, Karl Marx University, 7010 Leipzig, G.D.R.


ESR spectra of thianatocopper(II) complexes with imidazole derivatives were studied in ethanolic solutions at 295 and 123 K. Axialsymmetric spectra, attributed to the monomeric complex units, were obtained for the frozen solutions. The bonding parameters were interpreted by using calculated g, Cu-hyperfine, and 14N-ligand hyperfine splitting values. The Cu-N bond parameters indicate a considerable delocalization of the unpaired electron. The values of the isotropic Cu-hyperfine splitting suggest that the deviations from the planar symmetry of the CuN4 units are due to tetrahedral perturbation of the ligand field.