Abstract
A new iron (II) hydroxyphosphate, (NH 4Cl)Fe 14(OH) 6(PO 4) 6(HPO 4) 2, has been synthesized using hydrothermal technique. It crystallizes in the monoclinic C2/m space group with a = 16.573(5) Å, b = 6.309(1) Å, c = 16.623(4) Å and β = 115.434(17)° (V = 1569.7(4) Å 3, Z = 2). The unique structure of this compound is built up from phosphate and hydroxyphosphate tetrahedra sharing apices and edges with three different types of iron coordination polyhedra : octahedra, trigonal bipyramids and tetrahedra. The resulting 3D host lattice [Fe 14(OH) 6(PO 4) 6(HPO 4) 2] ∞ is electrically neutral and forms large eight-sided tunnels containing linear chains of ammonium chloride.
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