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1996 (1)
1Author    K. Yamada, T. Ohtani, S. Shirakawa, H. Ohki, T. Okuda, T. Kamiyama, K. OikawaRequires cookie*
 Title    Phase Transition of C 5 H 5 NHSbBr 4 Having a Hypervalent Bond: A 2 H NMR and X-Ray Diffraction Study* [Phase Transition of C 5 H 5 NHSbBr 4 l  
 Abstract    The second order phase transition at 253 K of pyridinium tetrabromoantimonate(III), C 5 H 5 NHSbBr 4 , has been characterized by means of X-ray diffraction and 2 H NMR. As was suggested from the 81 Br NQR spectra, the Rietveld refinements of the X-ray diffraction patterns at 297 K and 116 K confirm the structural change of the anion from SbBr 4 to SbBr 3 • Br -. The line shape analysis of the 2 H NMR using the deuterated analog revealed that the librational amplitude of the pyridinium ring about the axis normal to the plane increased with temperature and its rms amplitude reaching ca. 25° at T c . The librational motion may induce the phase transition breaking the hydrogen bonds of the type N-H -Br. However, nearest-neighbor 2n/6 jump or reorientation such as seen in benzene were not observed even at 350 K. 
  Reference    Z. Naturforsch. 51a, 739—744 (1996); received October 11 1995 
  Published    1996 
  Keywords    2 H NMR, 81 Br NQR, Rietveld analysis, Phase transition, Hypervalent bond 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0739.pdf 
 Identifier    ZNA-1996-51a-0739 
 Volume    51