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DOI: 10.1039/A700472I (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1997, 2221-2226

[HN(CH2CH2)3NH]3[Fe8 (HPO4)12(PO4)2(H 2O)6]: an organically templated iron phosphate with a pillared layer structure

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Kwang-Hwa Lii and Yuh-Feng Huang

Abstract

An organically templated iron phosphate, [HN(CH2CH2)3NH]3[Fe8 (HPO4)12(PO4)2(H 2O)6], has been synthesized under solvothermal conditions and characterized by single-crystal X-ray diffraction, Mössbauer spectroscopy and thermogravimetric analysis. The compound crystallizes in the trigonal space group P[3 with combining macron]c1 (no. 165) with a = 13.5274(5), c = 19.2645(6) Å, U = 3052.9(3) Å3 and Z = 2. The structure consists of layers of corner-sharing FeO6 and FeO5(OH2) octahedra and PO4 and PO3(OH) tetrahedra which are pillared through additional FeO6 octahedra to form a three-dimensional framework structure. The framework contains a two-dimensional array of intersecting channels in which the charge compensating diprotonated 1,4-diazabicyclo[2.2.2]octane cations reside. The framework is closely related to that of an imidazole encapsulating indium phosphate, [H3O][C3N2H5]3 [In8(HPO4)14(H2O)6 ]·5H2O.

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