Analysis of the covalent bonding and EPR parameters of dendrimeric liquid-crystal copper(II) complexes

Experimental EPR data for copper(II) complexes with liquid-crystal poly(propylenimine) den-drimers were analyzed. The influence of the pseudotetrahedral distortion of the nearest environment of the copper ion on the parameters of the EPR spectra was considered. The covalent bond parameters were calculated from the EPR data. The dependence of the delocalization of the unpaired electron of the copper ion on the pseudotetrahedral distortion of its coordination unit was determined. The behavior of the Zeeman coupling parameters was discussed. Various contributions to the components of the hyperfine coupling (HFC) tensor were calculated. The causes of the changes in the HFC parameters in the distorted complexes were dis cussed.