Hydrothermal synthesis, crystal structure, and spectroscopic characterization of a new organically templated mixed-anion fluoro-arsenate-phosphate iron(III) compound, (C 2H 10N 2)[Fe 2(AsO 4) 2− x(PO 4) xF 2(H 2O)] ( x = 0.46)

Abstract

A new organically templated mixed-anion fluoro-arsenate-phosphate iron(III) compound, (C 2H 10N 2)[Fe 2(AsO 4) 2− x (PO 4) x F 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 Pbca orthorhombic space group, with the unit-cell parameters a=10.457(4), b=10.093(3), c=20.479(1) Å 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.