Ferromagnetically coupled heterobinuclear Cu(Ⅱ)-Ln(Ⅲ) complexes with N,N'-bis(2-aminoethyl)-oxamido dianion as a bridged ligand |
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作者姓名: | LI Yan-Tuan LIAO Dai-Zheng JIANG Zong-Hui WANG Geng-Lin |
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作者单位: | LI,Yan-Tuan LIAO,Dai-Zheng JIANG,Zong-Hui WANG,Geng-LinDepartment of Chemistry,Nankai University,Tianjin 300071,China |
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基金项目: | Project supported by the National Natural Science Foundation of China. |
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摘 要: | Six novel μ-oxamido heterobinuclear complexes, namely Cu(oxae)Ln(Me2bpy)2-(ClO4)3 (Ln=La, Nd, Gd, Tb, Ho, Er), where oxae denotes N, N'-bis(2-aminoethyl)oxamido dian-ion, Me2bpy is 4,4'-dimethyl-2,2'-bipyridyl, have been synthesized and characterized by elemental analyses, IR, conductivity measurements and electronic spectra. The temperature dependence of the magnetic susceptibility of Cu(oxae)Gd(Me2bpy)2(ClO4)3 has been meaured over the range 4-300 K. The least-squares fit of the experimental susceptibilities yielded J - 1.87 cm-1.The observed Gd(Ⅲ)-Cu(Ⅱ) coupling is ferromagnetic. One plausible mechanism that can cause a ferromagnetic coupling between Gd(Ⅲ) and Cu(Ⅱ) is discussed in terms of spin-polarization.
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