SYNTHESIS, CHARACTERIZATION AND MAGNETIC-PROPERTIES OF NOVEL MU-OXAMIDO HETERODINUCLEAR COPPER(II)-LANTHANIDE(III) COMPLEXES

Six novel mu-oxamido heterobinuclear complexes have been prepared and identified as Cu(oxpn)Ln(L)(2)(ClO4)(3), where oxpn denotes the N, N'-bis(3-aminopropyl)oxamido dianion, L, 1,10-phenanthroline (phen) and Ln stands for La, Nd, Gd, Tb, Ho, Er. The complexes Cu(oxpn)Gd(phen)(2)(ClO4)(3) were characterized with variable temperature magnetic susceptibility(4-300 K). The exchange integral J((Cu-Gd)) was found to be 2.03 cm(-1) The result is commensurate with ferromagnetic interaction between the adjacent metal ions. One plausible mechanism that can cause a ferromagnetic coupling between Gd(III) and Cu(II) is also discussed in terms of spin polarization.