Electrostatic solvent effect on the formation of the mixed-chelate complex (acetylacetonato)(diethyldithiocarbamato)copper(II)
Spectrophotometric and e.s.r. analyses have been carried out on the mixed-chelate complex formation equilibrium [Cu(acac)2]+[Cu(S2CNEt2)2]⇌ 2[Cu(acac)(S2CNEt2)], where acac = acetylacetonate. The equilibrium constant in non-aqueous solution is found to decrease with increasing dielectric constant of the solvent. The results are analyzed in terms of an electrostatic model in which each complex molecule is assumed to be in a cavity surrounded by uniform solvent.