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1997 (1)
1Author    M. Höhling, W. PreetzRequires cookie*
 Title    Synthesis and Crystal Structure of Tetraphenylarsonium Pentachlorocarbonylosmate(IV), (Ph4As)[OsCl5(CO)]  
 Abstract    The structure of tetraphenylarsonium pentachlorocarbonylosmate(IV), (Ph4As)[OsCl<;(CO)], the first example of a halogenocarbonyl complex with osmium in the oxidation state +IV, has been determined at 208oK by single crystal X-ray diffraction: tetragonal, space group P4/n with a = 12.821 , c = 8.084 A, Z = 2. There are short intermolecular contacts between neighbouring anions along the tetragonal axis c and unusually large displacement ellipsoids of the carbonyl group and the four equatorial Cl ligands arising from a positional disorder of the complex anion. By analogy with a variety of reported structures of the (Ph4As)[RuNCl4] structure type this is attributed to the close packing of the cation sublattice. Compared to other monocarbonylosmates the Os-C bond of 1.94(2) A is extraordinaryly long while the bond between Os and the trans coordinated Cl ligand of 2.286(3) A is rather short. 
  Reference    Z. Naturforsch. 52b, 978—980 (1997); received June 2 1997 
  Published    1997 
  Keywords    Pentachloromonocarbonylosmate(IV), Crystal Structure, Positional Disorder 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0978.pdf 
 Identifier    ZNB-1997-52b-0978 
 Volume    52