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1 Polish Journal of Chemistry

1 2002

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Synthesis and Magnetism of Copper(II)-Lanthanoid(III) Heterobinuclear Complexes with N,N'

Li Y.-T., Yan C. -W., Wang G.-M.

Polish Journal of Chemistry

2002

Vol. 76 / nr 5

653-662

Eleven novel ž-oxamido-bridged copper(II)-lanthanoid(III) heterobinuclear complexes described by the overall formula Cu(obp)Ln(Ph2-phen)2ClO4 (Ln = Y, La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb), where obp denotes N,N_-oxamidobis(propionato) and Ph2-phen represents 4,7-diphenyl-1,10-phenanthroline (Ph2-phen), have been synthesized and characterized by elemental analyses, spectroscopic (IR, UV, ESR) studies, and molar conductivity measurements. The temperature dependence of the magnetic susceptibility of complex Cu(obp)Gd(Ph2-phen)2ClO4 has been measured over the range 4.2~300 K and the magnetic properties were studied in detail, demonstrating the presence of a very weak ferromagnetic interaction between the adjacent Gd(III) and Cu(II) ions through the oxamido-bridge. Based on the spin Hamiltonian operator, _ _ _ H = 2JS S 1 2 _ _ , the exchange integral (J) was evaluated as +2.98 cm-1. A plausible mechanism for the ferromagnetic coupling between Gd(III) and Cu(II) is discussed in terms of spin-polarization.