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1 Polish Journal of Chemistry

1 2005

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Synthesis and Magnetic Studies of Copper(II)-Lanthanide(III) Heterobinuclear Complexes Bridged by N,N'-Bis[3-(dimethylamino)propyl]oxamido

100%

Li Y. , Yan C. , Wu Z. , Zhu C.

2005

tom Vol. 79 / nr 1

37-46

Ten new copper(II)-lanthanide(III) heterobinuclear complexes bridged by N,N'-bis[3- (dimethylamino)propyl]oxamido dianions (dmoxpn) and end-capped with 2,2'-bipyridine (bpy), namely, Cu(dmoxpn)Ln(bpy)2(NO3)3 (Ln = La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb), have been synthesized and characterized by elemental analyses, molar conductivity measurements, and spectroscopic (IR, UV, ESR) studies. The Cu(dmoxpn)Gd(bpy)2(NO3)3 complex was further characterized by variable-temperature magnetic susceptibility (4.2~300 K) measurements and the magnetic data have been also used to deduce the indicated heterobinuclear structure. The results derived from least-squares fit of the experimental data have confirmed that the adjacent copper(II) and gadolinium(III) ions through the oxamido-bridge in the complex are ferromagnetically coupled with the exchange integral J(Cu-Gd) = +8.59 cm-1. A plausible mechanism for the ferromagnetic coupling between gadolinium(III) and copper(II) is discussed in terms of spin-polarization.