Single Crystal Growth and Crystal Structure of Mercurous Diarsenate(V), (Hg2)2(As2O7) |
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Authors: | Matthias Weil |
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Abstract: | Polycrystalline mercurous diarsenate(V), (Hg2)2(As2O7), was prepared by a redox‐reaction between stoichiometric amounts of HgO and As2O3. Canary yellow single crystals were obtained by subsequent chemical transport reactions using HgCl2 as transport agent 550 → 500 °C, 5 d, sealed and evacuated silica ampoules]. The crystal structure (orthorhombic, Pnma, Z = 4, a = 9.9803(8), b = 12.2039(10), c = 7.2374(6)Å) is composed of two crystallographically independent Hgequation/tex2gif-stack-1.gif dumbbells (d¯(Hg—Hg) = 2.5133Å) with a symmetric oxygen coordination sphere, and a diarsenate group with a staggered conformation and a bent bridging angle As—O—As = 121.0(7)°. The building units are arranged in a layer‐like assembly parallel to (010) and are connected via common oxygen atoms to form a three‐dimensional network. |
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Keywords: | Mercury Diarsenate(V) Crystal structure |
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