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Hydrothermal Single Crystal Growth and Crystal Structures of the Mercury(II) Selenates(VI) HgSeO4, HgSeO4·HgO and HgSeO4·2HgO
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Matthias Weil
Published/Copyright:
June 2, 2014
Colourless single crystals of HgSeO4 were prepared under hydrothermal conditions by reacting yellow HgO in concentrated selenic acid at 250 °C (10 d); yellow crystals of HgSeO4 HgO and red-brown crystals of HgSeO4 2HgO were obtained during hydrolysis of the so prepared HgSeO4 in demineralized water at 200 °C (7 d). All crystal structures were solved and refined from single crystal diffractometer data sets. The structures of HgSeO4 and HgSeO4 2HgO are isotypic with the corresponding sulphates. They are based on [HgO7] polyhedra with a [4+3] coordination around the mercury atom and isolated SeO42- tetrahedra for HgSeO4, as well as hexagonal [Hg3O2]2+ nets perpendicular to [001] and disordered SeO42- tetrahedra in the interstices of the nets for HgSeO4 2HgO. The hitherto unknown compound HgSeO4 HgO crystallizes in a new structure type. The main structural features of this compound are 1∞[O-Hg-O] zigzag chains which extend parallel to [010] and are built of two crystallographically independent Hg and O atoms, isolated SeO42- tetrahedra situated between the chains and [HgOx] polyhedra (x = 6 and 7) connecting both building units via common oxygen atoms
Received: 2002-4-22
Published Online: 2014-6-2
Published in Print: 2002-9-1
© 1946 – 2014: Verlag der Zeitschrift für Naturforschung
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