EPR-SPECTRA OF 4 GADOLINIUM COMPLEXES WITH SCHIFF-BASES

EPR spectra of four new gadolinium complexes with Schiff bases in poly crystalline powder and those of these complexes in three organic solve nts were investigated at different temperatures. It has been observed for the first time that their freezing solution spectra are quite diff erent from each other. In THF one peak was observed only, but there we re three peaks and typical ''U'' spectral features appearing in DMF an d DMSO at low temperatures. On the basis of spin Hamiltonian of S=7/2 system, the correlations between crystal field strength in complexes a nd local symmetry around Gd3+ ions are discussed.