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1 Polish Journal of Chemistry

1 2003

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Synthesis and magnetic Properties of mi-2-Nitroterephthalato-Bridged Binuclear Lanthanide(III) Complexes

Li Y., Zhang J., Yan C. -W.

Polish Journal of Chemistry

2003

Vol. 77 / nr 7

797-804

Nine new binuclear lanthanide(III) complexes described by the overall formula [Ln2(NTPHA)(Me2bpy)4(ClO4)2](ClO4)2 (Ln = La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er), where Me2bpy stands for 4,4_-dimethyl-2,2_-bipyridine, and NTPHA represents the 2-nitroterephthalate dianions, have been synthesized and characterized by elemental analyses, IR, ESR and electronic spectra, and molar conductance measurements. It is proposed that these complexes present NTPHA-bridged structures consisting of two lanthanide(III) ions. The variable-temperature magnetic susceptibilities (4~300 K) of complex [Gd2(NTPHA)(Me2bpy)4(ClO4)2](ClO4)2 were measured and studied, demonstrating a very weak antiferromagnetic spin-exchange interaction between Gd(III)-Gd(III) ions within the complex. Based on the spin Hamiltonian operator,_ _ _ H = 2JS S 1 Ĺ 2, the exchange parameter (J) was evaluated as -0.12 cm-1.