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1997 (1)
1Author    W. Preetz, A. KrullRequires cookie*
 Title    Kristallstrukturen, Schwingungsspektren und Normalkoordinatenanalysen von Tetrahalogenooxalatoosmaten (IV), [OsX4(ox)]2', X = Cl, Br, I Crystal Structures, Vibrational Spectra and Normal Coordinate Analyses of Tetrahalogenooxalatoosmates (IV), [OsX4(ox)]2~, X = Cl, Br, I  
 Abstract    The crystal structures of [(C5H5N)iC H 2][OsCl4(ox)] (monoclinic, space group I2/m, a = 10.260(5), b = 13.841(5), c = " 12.273(5) Ä, ß = 92.050(5)°, Z = 4), [(C5H5N)2CH2j[O sBr4(o x)]H 20(m onoclinic, space g ro u p P 2 ,/n ,a = 11.666(3),b = 11.591(5), c = 14.926(2) A, ß = 102.45(2)°, Z = 4) and [P(C6H5)4M O sI4(ox)]-2CH2C12 (triclinic, space group P i, a = 14.597(2), b = 11.9185(9), c = 22.5624(14) A, a = 80.284(8), ß = 78.903(8), 7 = 69.432(8)°, Z = 2) have been determined by single crystal X-ray diffraction analysis. The IR and Raman spectra of the three complexes were measured at room temperature. Using the molecular parameters of the X-ray determinations normal coordinate analyses based on a modified valence force field have been performed and the normal modes o f vibration are assigned. With a set of 25 force constants and taking into account the innerligand vibrations a good agreement between observed and calculated frequencies has been achieved. The valence force constants of the X-Os-X axis are fd(OsCl) = 1.77, fd(OsBr) = 1.48, fd(OsI)o= 1.0 mdyn/A, of the X'-Os-O* axes are fd(O sCl') = 1.88, fd(OsBr') = 1.6, fd(OsI') =1.1 mdyn/A and fd(OsO*) ranges from 2.7 to 2.8 mdyn/A. 
  Reference    Z. Naturforsch. 52b, 315—322 (1997); eingegangen am 27. November 1996 
  Published    1997 
  Keywords    Tetrachlorooxalatoosmate(IV), Tetrabromooxalatoosmate(IV), Tetraiodooxalatoosmate(IV), Crystal Structure, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0315.pdf 
 Identifier    ZNB-1997-52b-0315 
 Volume    52