Acta Crystallographica Section C

Crystal Structure Communications

Volume 61, Part 9 (September 2005)

inorganic compounds

Acta Cryst. (2005). C61, i86-i89 [doi:10.1107/S0108270105022894]

Octahedral-tetrahedral framework structures of InAsO₄·H₂O and PbIn(AsO₄)(AsO₃OH)

U. Kolitsch and K. Schwendtner

Abstract: Indium arsenate(V) monohydrate, InAsO₄·H₂O, (I), crystallizes in the structure type of MnMoO₄·H₂O. The structure is built of In₂O₈(H₂O)₂ dimers (mean In-O = 2.150 Å) corner-linked to slightly distorted AsO₄ tetrahedra (mean As-O = 1.686 Å). The linkage results in a three-dimensional framework, with small voids into which the apical water ligand of the InO₅(H₂O) octahedron points. The hydrogen bonds in (I) are of medium strength. Lead(II) indium arsenate(V) hydrogen arsenate(V), PbIn(AsO₄)(AsO₃OH), (II), represents the first reported lead indium arsenate. It is characterized by a framework structure of InO₆ octahedra corner-linked to AsO₄ and AsO₃OH tetrahedra. The resulting voids are occupied by Pb₂O₁₀(OH)₂ dimers built of two edge-sharing highly distorted PbO₆(OH) polyhedra (mean Pb-O = 2.623 Å). The compound is isotypic with PbFe^III(AsO₄)(AsO₃OH). The average In-O bond length in (II) is 2.157 Å. In both arsenates, all atoms are in general positions.

Formula: InAsO₄·H₂O and PbIn(AsO₄)(AsO₃OH)


	Structure factor file (CIF format) (70.4 kbytes) Contains datablock I

	Structure factor file (CIF format) (93.7 kbytes) Contains datablock II

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