Three-dimensional metal phosphonodicarboxylates with GIS-zeolite topology: syntheses, structures and magnetic studies |
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Authors: | Wang Peng-Fei Duan Yan Wang Tian-Wei Li Yi-Zhi Zheng Li-Min |
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Institution: | State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing National Lab of Microstructure, Nanjing University, Nanjing, 210093, P. R. China. |
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Abstract: | Compounds M(2)(4-pi)(H(2)O)(4)]·1.5H(2)O M(II) = Mn(1), Co(2), Ni(3)] and a heterometallic analogue Co(1.14)Ni(0.86)(4-pi)(H(2)O)(4)]·1.5H(2)O (4) have been synthesized utilizing a rigid 4-phosphonoisophthalic acid (4-piH(4)). Compounds 1-4 are isostructural, confirmed by their powder XRD measurements. Single crystal structural determinations of 1 and 2 reveal that these compounds display a novel pillared layered open framework structure with zeolite gismondine (GIS) topology. Within the layer, edge-sharing {MO(6)} octahedra are found, which are connected by carboxylate and phosphonate groups along the c- and b-axis, respectively. Dominant antiferromagnetic interactions are propagated between the magnetic centers in 1, 2 and 4. While in 3, ferromagnetic exchange couplings are observed. |
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