Hydrothermal synthesis, crystal structure, and spectroscopic characterization of a new organically templated mixed-anion fluoro-arsenate-phosphate iron(III) compound, (C_2H_(10)N_2)[Fe_2(AsO_4)_(2-x)(PO_4)_xF_2(H_2O)] (x = 0.46)

摘要

A new organically templated mixed-anion fluoro-arsenate-phosphate iron(III) compound, (C_2H_(10)N_2)[Fe_2-(AsO_4)_(2-x)(PO_4)_xF_2(H_2O)] (x = 0.46), has been synthesized by using mild hydrothermal conditions under autogeneous pressure. The crystal structure has been solved from X-ray single-crystal data. The compound crystallizes in the Phca orthorhombic space group, with the unit-cell parameters a = 10.457(4), b = 10.093(3), c = 20.479(1) A and Z = 8. The crystal structure consists of a three-dimensional inorganic framework containing two different kinds of layers. The sheets are formed by Fe_2O_8F_2 edge-sharing dimer octahedra and FeO_5F octahedra, which are connected to the AsO_4 and PO_4 tetrahedra. The IR spectrum shows the bands of the ethylenediammonium cation and the arsenate and phosphate anions.