Synthesis, crystal structures, and magnetic properties of six transition metal phosphonates
Hailong Xu1, Hong Zhou, Lu Feng
1College of Chemistry and Environmental Technology, Wuhan Institute of Technology, Wuhan 430073, China. hzhouh@126.com.
Abstract:
Six coordination polymers of metal phosphonates, [Co3(HL)2(H2O)4]·2H2O (1), [Cu(H2L)H2O] (2), [Fe3(L)2(H2O)3OH]·2H2O (3), [Cu2(L)(4,4'-bipy)1.5]·5H2O (4), [Co(H2L)(4,4'-bipy)0.5] (5), and [Ni(H2L)(4,4'-bipy)0.5] (6) (H4L = 4-F-C6H4CH2N(CH2PO3H2)2), have been synthesized by hydrothermal methods and structurally characterized by X-ray single-crystal diffraction, infrared spectroscopy, elemental analysis and thermogravimetric analysis. Complexes 1-3 exhibit a 2D inorganic layer structure with a regular and alternate arrangement of metal ions and PO3 groups, where the layers are connected by moderately strong hydrogen bonds to form a supramolecular 3D network. Complexes 4-6 have a one-dimensional chain structure connected through similar coordination modes with 1-3, where each chain is rejoined by 4,4'-bipy bridges, forming layer coordination polymers. In addition, three complexes contain abundant water molecules, which exhibit different aggregation modes, clusters and chains, respectively. The magnetic properties of complexes 1-6 have been quantificationally studied using the Curie-Weiss law and the PHI program package.
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