| Abstract: | ESR and optical absorption studies have been carried out on bis[N-(2-hydroxyethyl)ethylenediamine] copper II-chloride, -bromide, -nitrate, -sulphate, bis(N-methylethylenediamine) copper II thiocyanate and bis(N,N′-dimethylethylenediamine) copper II thiocyanate, in non-interacting solvents at room and liquid nitrogen temperatures. The molecular orbital coefficients are estimated assuming axial symmetry and indicate that the in-plane π bond is as strong as the σ bond. The consistency in the value of the χ parameter, which is proportional to the hyperfine constants, indicates that it is quite independent of the ligand substitution and depends upon the immediate environment of the copper II ion. |
