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Three-Dimensional 3d−4f Polymers Containing Heterometallic Rings: Syntheses, Structures, and Magnetic Properties

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posted on 15.10.2007, 00:00 by Yan Ouyang, Wei Zhang, Na Xu, Gong-Feng Xu, Dai-Zheng Liao, Kazuyoshi Yoshimura, Shi-Ping Yan, Peng Cheng
Two novel three-dimensional (3D) 3d−4f mixed complexes [Ln(H2O)4][Ni2TTHA(SCN)2]·H3O+ [Ln = Pr (1), Ce (2); H6TTHA = triethylenetetraaminehexaacetic acid], based on the building blocks of [Ni2TTHA(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. Δ = 2.83, zJ‘ = −0.6 cm-1 for complex 1 and g = 2.07, Δ = 1.00, zJ‘ = −0.5 cm-1 for complex 2.