Three-dimensional 3d-4f polymers containing heterometallic rings: syntheses, structures, and magnetic properties |
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Authors: | Ouyang Yan Zhang Wei Xu Na Xu Gong-Feng Liao Dai-Zheng Yoshimura Kazuyoshi Yan Shi-Ping Cheng Peng |
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Institution: | Department of Chemistry, Nankai University, Tianjin 300071, China. |
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Abstract: | Two novel three-dimensional (3D) 3d-4f mixed complexes Ln(H(2)O)(4)]Ni(2)TTHA(SCN)(2)].H(3)O+ Ln = Pr (1), Ce (2); H(6)TTHA = triethylenetetraaminehexaacetic acid], based on the building blocks of Ni(2)TTHA(SCN)(2)](4-), were synthesized and characterized by X-ray crystal diffraction and magnetic properties. The single-crystal structures show that these complexes form a 3D framework, comprised of an unusual infinite one-dimensional chain based on heterometallic Ln2Ni2 rings. The temperature-dependent magnetic susceptibilities were analyzed by an approximate model, leading to g = 2.06. Delta = 2.83, zJ' = -0.6 cm-1 for complex 1 and g = 2.07, Delta = 1.00, zJ' = -0.5 cm(-1) for complex 2. |
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