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1995 (1)
1Author    M. Arietta, S. Schriewer-Pöttgen, Wolfgang JeitschkoRequires cookie*
 Title    Two Modifications of Hg5Re2O 10  
 Abstract    The previously reported mercury perrhenate Hg5 Re2O 10, prepared hydrothermally, has now been obtained by reaction of HgO with the mercury(II) metaperrhenate H g (R e 0 4)2 in sealed silica tubes. A second modification o f this compound can be obtained by reaction of elem ental mercury with H g (R e 0 4)2 also in sealed silica tubes. Its crystal structure has been determined from single-crystal X-ray data: P 2 x/c, a -861.5(1), b = 1200.9(2), c = 1203.9(2) pm, ß = 97.15(1)°, Z = 4, R = 0.024 for 1733 structure factors and 105 variables. Both modifi­ cations may be represented by the formula H g2+-2H g20 -2 R e 0 4_, indicating that mercury occurs in oxidation states I and II. In both modifications the mercury and some oxygen atoms form two-dimensionally infinte, puckered, cationic nets of the composition (H g2+-2H g20)" , which are separated by the R e 0 4~ tetrahedra. In the modification reported earlier the mer­ cury oxygen nets consist of condensed 16-membered rings, while the nets of the present modification contain 10-and 22-membered rings. 
  Reference    Z. Naturforsch. 50b, 1335—1339 (1995); received February 27 1995 
  Published    1995 
  Keywords    Crystal Structure, Mercury Perrhenates, Phase Transitions 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1335.pdf 
 Identifier    ZNB-1995-50b-1335 
 Volume    50