Synthese und Kristallstruktur von Hydrogenselenaten zweiwertiger Metalle – M(HSeO4)2 (M = Mg,Mn, Zn) und M(HSeO4)2 · H2O (M = Mn,Cd) |
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| Authors: | I. Morosov S. Troyanov A. Stiewe E. Kemnitz |
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| Abstract: | Synthesis and Crystal Structure of Hydrogen Selenates of Divalent Metals – M(HSeO4)2 (M = Mg, Mn, Zn) and M(HSeO4)2 · H2O (M = Mn, Cd) New hydrogen selenates M(HSeO4)2 (M = Mg, Mn, Zn) and M(HSeO4)2 · H2O (M = Mn, Cd) have been synthesized using MSeO4 (M = Mg, Mn, Zn, Cd) and 90% selenic acid as starting materials. The crystal structures have been determined by X-ray single crystal crystallography. The compounds M(HSeO4)2 (M = Mg, Zn) belong to the structure type of Mg(HSO4)2, whereas Mn(HSeO4)2 forms a new structure type. Both hydrogen selenate monohydrates are isotypic to Mg(HSO4)2 · H2O. In all compounds the metal atoms are octahedrally coordinated by oxygen atoms of different HSeO4-tetrahedra. In the HSeO4-tetrahedra the Se–OH-distances (mean value 1.70 Å) are about 0.1 Å longer than Se–O-distances (mean value 1.62 Å). In the structure of M(HSeO4)2 (M = Mg, Zn) there are zigzag chains of hydrogen bonded HSeO4-tetrahedra. The structure of Mn(HSeO4)2 is characterized by chains of HSeO4-tetrahedra in form of screws. Hydrogen bonds from and to water molecules connect double layers of MO6-octahedra and HSeO4-tetrahedra in the structures of M(HSeO4)2 · H2O. |
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| Keywords: | Metal(II) Hydrogen Selenates Hydrogen Selenate Monohydrates Synthesis, Crystal Structure |
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