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Denis Orosel, Robert E. Dinnebier, Paul Balog, Martin Jansen

The crystal structure of a new mixed valence arsenic(III,V)oxoacid H₆As³⁺₇As⁵⁺₇O₃₁

Keywords: Mixed-valence arsenic, High pressure synthesis, Powder diffraction structure analysis, X-ray diffraction, Synchrotron Radiation

We report on a new mixed valence arsenic(III,V)oxoacid H₆As³⁺₇As⁵⁺₇O₃₁ which crystallizes in the hexagonal space group P6₃ (no. 173), with lattice parameters a = 12.0525(1) Å, c = 4.7344(1) Å, V = 595.6(1) ų and Z = 2. This phase is metastable and upon heating the RT-phase of As₂O₅ is recovered. The structure exhibits the first As⁵⁺ atom with a fivefold coordination by oxygen atoms in the shape of a distorted square pyramid. The positions of the hydrogen atoms were determined during the structure refinement from high resolution synchrotron powder diffraction data by difference Fourier analysis.

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 222, 07/2007
Pages: 321 - 325

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