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'Layered compounds Activation parameters' in keywords Facet   Publication Year 1996  [X]
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1Author    T. Ueda, K. Shimizu, H. Ohki, T. OkudaRequires cookie*
 Title    C CP/MAS NMR Study of the Layered Compounds [C 6 H 5 CH 2 CH 2 NH3] 2 [CH 3 NH 3 ] fI _ 1 Pb n l3 n+1 (n = 1, 2)  
 Abstract    19, 1996 13 C CP/MAS NMR spectra were measured on the layered compounds [C 6 H 5 CH 2 CH 2 NH 3 ] 2 [CH 3 NH 3 ] n _ 1 Pb"I 3n + j (w = 1, 2). The linewidth of the resonance peak corresponding to the phenyl carbons changed with temperature. The maximum broadening took place at 363 K for both com-pounds. The activation energy £ a for the reorientation of the phenyl group was determined to be 25 kJ mol" 1 for n — 1 and 26 kJ mol" 1 for n = 2. The frequency factor t 0 was evaluated from the linewidth at 363 K. The value of the second moment, estimated from the maximum linewidth, was interpreted by assuming a 180° flip of the phenyl group around its two-fold axis. The similarity of the activation energies for the reorientation of the phenyl group suggested that the local structure and the molecular motion of the organic cations is little affected by the difference in the sub-structure of the inorganic layer in those compounds. 
  Reference    Z. Naturforsch. 51a, 910—914 (1996); received March 
  Published    1996 
  Keywords    13 C CP/MAS NMR, Molecular motion, Layered compounds Activation parameters, Local structure 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0910.pdf 
 Identifier    ZNA-1996-51a-0910 
 Volume    51