SYNTHESIS AND PROPERTIES OF COPPER(II)-LANTHANIDE(III) COMPLEXES OF (3-FORMYL-5-METHYLSALICYLIDENE)-1,3-PROPANEDIAMINE

Heteronuclear copper(II)-lanthanide(III) complexes of H-2(Fsal-3), CuL n(Fsal-3)(NO3)(3) (CH3OH)(0.5) (Ln: La, Nd, Eu, Gd or Ho), were synthe sized and characterized, where H-2(Fsal-3) denotes N,N'-bis(3-formyl-5 -methylsalicylidene)-1 ,3-propanediamine, and Cu-II and Ln(III) are lo cated at the N2O2- and O-4-coordination sites of ligand, respectively. The bonding behavior of amino alcohols toward the Cu-Ln heterometal c entre was discussed, based on the absorption spectra and circular dich roism. The fluorescence intensity of Eu-III decreased markedly in the Cu-Eu complex. Cryomagnetic measurements (4.2-260 K) for the Cu-Gd com plex revealed that the spin coupling between Cu-II and Gd-II ions is f erromagnetic with coupling constant J = +0.8 cm(-1), on the basis of t he spin-Hamiltonian H = -2JS(Cu). S-Gd. (C) 1997 Elsevier Science Ltd.