Electron spin resonance and electronic spectral studies on ligation of dimeric copper(II) complex by solvent molecules

Abstract

The problem of ligation by various organic solvents was investigated for Cu 2(AoAPh) 2, where AoAPh represents tridentate Schiff base derived from acetylacetone and o-aminophenol. ESR and electronic spectra indicated the dissociation of Cu 2(AoAPh) 2 into two adduct complexes Cu(AoAPh)L under the influence of the polar solvent (L = pyridine, piperidine, DMF, DMSO etc.). The Schiff base 14N superhyperfine splitting was analysed in the ESR spectra. The adducts were isolated in crystalline form. Thermal analysis of these adducts showed the loss of the L ligand and formation of the dimeric complex in temperature range 330–390 K.