Alkoxo-bridged copper(II) complexes: Magnetic and spectral studies of alkoxo-bridged copper(II) complexes with N,N-dialkylaminoalcohols

Abstract

Sixteen new binuclear (and/or polynuclear) copper(II) complexes with N,N-dialkylaminoalcohols, [Cu( R 2NCH 2CH 2O) X] and [Cu( R 2NCH(CH 3)CH 2 O) X], (where R = CH 3, C 2H 5, n-C 3H 7, n-C 4H 9, X = Cl −, Br −, NCS −) were prepared. The electronic spectra and temperature dependence of magnetic susceptibilities (80–295 K) of the compounds were measured. From the results, it was shown that (1) the complexes with X = NCS − have the alkoxo-bridged binuclear structure, similar to those of chloro- and bromo-complexes and (2) the empirical rule on the magnetic and spectral properties of the alkoxo-bridged binuclear copper(II) complexes, that is, “an antiferromagnetic (intramolecular) interaction is operative for the complexes which show distinct absorption bands in the near-UV region (24–29 kK), whereas a weak ferromagnetic interaction is operative for the complexes which show no distinct absorption bands in the near-UV region” is valid for all the complexes investigated. Based on the results, we proposed a new criterion for the classification of binuclear copper(II) aminoalcohol complexes.