The crystal structures of Hg7Se3O13H2 and Hg8Se4O17H2 — two mixed-valent mercury oxoselenium compounds with a multifarious crystal chemistry
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Matthias Weil
Abstract
Single crystals of the mixed-valent compounds Hg7Se3O13H2 (I) and Hg8Se4O17H2 (II) were grown under hydrothermal conditions. The crystal structures were solved and refined from single crystal X-ray data collected at room temperature (I: R3, Z = 3, a = 5.9239(3), c = 37.096(3) Å, 1465 structure factors, 60 parameters, R[F2 > 2σ(F2)] = 0.0383, wR(F2 all) = 0.0970, Goof = 1.047; II: P31c, Z = 2, a = 5.8908(6), c = 31.048(3) Å, 1889 structure factors, 69 parameters, R[F2 > 2σ(F2)] = 0.0662, wR(F2 all) = 0.1626, Goof = 1.088). Both compounds show a multifarious crystal chemistry and contain triangular Hg34+ cluster cations, Hg22+ dumbbells, Hg2+ cations, HgO22– mercurate groups, and trigonal-pyramidal SeO32– as well as tetrahedral SeO42– anions and water molecules as simple building units. The description in terms of crystal chemistry leads to the more detailed formulae (HgIV/33) (HgI2)(HgII)(HgIIO2)(SeIVO3)2(SeVIO4)(H2O) for I and (HgIV/33)(HgI2)(HgII)2(HgIIO2)(SeIVO3)2(SeVIO4)2(H2O) for II, respectively. Characteristic features of the closely related structures are building blocks formed by parallel layers of Hg34+ triangles, layers of disordered Hg22+ dumbbells, layers of SeO42– and HgO22– groups, and layers of SeO32– groups which are all stacked along [001]. The layers are linked into a complex three-dimensional framework via common O atoms and H2O molecules. In comparison with Hg7Se3O13H2, the structure of Hg8Se4O17H2 contains an additional and disordered HgSeO4 layer which leads to a significant distortion of parts of the resulting structure.
© 2004 Oldenbourg Wissenschaftsverlag GmbH
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- Triphenylphosphine adducts of silver di-iso-propyl dithiophosphate
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- Books Received
Articles in the same Issue
- Structural changes upon the temperature dependent C2/c → P21/c phase transition in LiMe3+Si2O6 clinopyroxenes, Me = Cr, Ga, Fe, V, Sc and In
- X-ray diffraction study of decagonal Al—Co—Ni as a function of composition
- The correlation between metal oxidation state and bond valence parameters for M—O bonds (M = V, Fe and Cu). A simple method to search for the metal oxidation-state independent parameter pairs
- The crystal structures of Hg7Se3O13H2 and Hg8Se4O17H2 — two mixed-valent mercury oxoselenium compounds with a multifarious crystal chemistry
- Calculated growth form of melilites
- Similarities between the clathrasils DOH, DDR, MEP and MTN
- Thermal expansion, elastic and thermoelastic properties including crystal structure analyses of K-, Rb- and Cs-nitrilotriacetates
- Dichloro(cyclohexilidene-1-methylene)(phenyl)Te(IV). Looking for the theoretical treatment
- Synthesis, crystal structure and molecular conformation of (±)-1-oxoferruginol and (±)-shonanol
- Triphenylphosphine adducts of silver di-iso-propyl dithiophosphate
- In-situ pressure crystallization and X-ray diffraction study of 1,1,2,2-tetrachloroethane at 0.5 GPa
- Books Received
