The structure of Cu-II complexes with hydroxamic acids Cu[(RN)-N-1(O)-(O)CR
2](2), where R-1 = Ph, R-2 = Me; R-1 = Me, R-2 = Ph, was studied by ESR spe
ctroscopy. In toluene solutions and low-temperature glasses, the complexes
exist as two forms, which were identified as cis- and trans-isomers. The pr
oportions of the isomers were determined.