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1999 (1)
1998 (1)
1Author    Andreas Komath, Oliver BlecherRequires cookie*
 Title    Kristallstruktur und thermische Phasenumwandlung von Tetramethylammoniumcyanid, (Ct^^N+CN- Crystal Structure and Thermal Phase Transition of Tetramethylammonium Cyanide, (CH3)4N+CN~  
 Abstract    Tetramethylammonium cyanide crystallizes in the tetragonal space group P4/nmm, Z = 2, with cell dimensions a = 773.6(1), c = 546.8(1) pm. The cyanide ion is disordered in the plane perpendicular to the c-axis indicating a rotation. The room temperature phase undergoes a thermal phase transition at -59.9°C probably caused by an order-disorder transition of the cyanide ion. 
  Reference    Z. Naturforsch. 54b, 372—376 (1999); eingegangen am 3. November 1998 
  Published    1999 
  Keywords    Cyanides, Crystal Structure, Thermal Phase Transition 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0372.pdf 
 Identifier    ZNB-1999-54b-0372 
 Volume    54 
2Author    Vibrational Spectra, Sandra Loss, Caroline RöhrRequires cookie*
 Title    RbAsF6, CsA sF 6 und RbSbF6: Kristallstrukturen, Thermische Phasenumwandlungen und Schwingungsspektren RbAsF6, CsAsF6 and RbSbF6: Crystal Structures, Thermal Phase Transitions  
 Abstract    The title compounds are isostructural to CsSbFö and crystallize with the KOsFö structure type (space group RS, Z = 3) with the lattice constants a = 749.7(1) pm, c = 758.9(1) pm (RbAsFö), a = 772.3(1) pm, c = 805.0(1) pm (CsAsFö) and a = 767.0(1) pm, c = 786.1(2) pm (RbSbF6). The structures exibit nearly ideal [MFö]-octahedra, the alkaline cations are coordinated by 12 fluorine ions in a distorted cuboctahedral geometry. Cations and complex anions form a slightly distorted CsCl arrangement. On heating, the arsenates transform to a NaCl arrangement with disordered [AsF6] ions, whereas the antimonates of Rb and Cs form the corresponding disordered CsCl type at higher temperatures. The phase transitions and the i. r. and Raman spectra as well as the structural relations to the remaining hexafluoropnictates A![MVF6] are discussed. 
  Reference    (Z. Naturforsch. 53b, 75—80 [1998]; eingegangen am 14. Oktober 1997) 
  Published    1998 
  Keywords    Alkaline Hexafluoropnictates, Crystal Structure, Thermal Phase Transitions, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0075.pdf 
 Identifier    ZNB-1998-53b-0075 
 Volume    53