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Liu L.,Institute of Chemistry for Functionalized Materials | Li J.,Institute of Chemistry for Functionalized Materials | Sun Z.-G.,Institute of Chemistry for Functionalized Materials | Dong D.-P.,Institute of Chemistry for Functionalized Materials | And 4 more authors.
Zeitschrift fur Anorganische und Allgemeine Chemie | Year: 2010

By using piperazine as a structure-directing agent, four new metal phosphonates with layered structure, [PzH2]0.5[ML(H 2O)]. 1.5H2O [M = Co (1), Ni (2), Zn (3)] and [pz] 0.5[Sb2L2].H2O (4) (H3L = 2-hydroxyphosphonoacetic acid; pz = piperazine), have been hydrothermally synthesized and structurally characterized by single-crystal and powder X-ray diffraction, infrared spectroscopy, elemental analysis and thermogravimetric analysis. Compounds 1-3 are isostructural and comprise MO6 octahedra and CPO3 tetrahedra connected by [O3PCH(OH)CO 2]3- to form a 2D layered structure with a one-dimen-sional channel system along the a axis direction. In compound 4, two SbO4E trigonal bipyramids (E is a lone pair of electrons, which occupy an axial position) are interconnected into a dimer by corner-sharing. The so-built dimers are bridged by the CPO3 tetrahedra into a 2D layered structure with a one-dimensional channel system in the c axis direction. The protonated piperazine cations for compounds 1-3 and the piperazine molecules for compound 4 are located between two adjacent layers. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA. Source

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