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'Potential Energy' in keywords Facet   Publication Year 1999  [X]
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1Author    A. Pajzderska, J. Wąsicki, S. LewickiRequires cookie*
 Title    Molecular Motion in Tetraphenyltin Studied by NMR  
 Abstract    NMR second moment and spin-lattice relaxation times in the laboratory (60 and 25 MHz) and in the rotating frame (B { = 2.1 mT) were studied for polycrystalline tetraphenyltin Sn(C 6 H 5) 4 in a wide tem-perature range. Two kinds of motions were detected: isotropic rotation of whole molecules and reorien-tations/oscillations of phenyl rings. A dependence of the potential energy of the molecule in the crystal on the angle of the phenyl ring rotation about the Sn-C bond was obtained on the basis of atom-atom calculations. The amplitude of the ring-oscillations at 133 K was estimated as ± 7°. Below room tem-perature the magnetisation recovery is significantly non-exponential, which may be interpreted as due to the correlated motion of phenyl rings. 
  Reference    Z. Naturforsch. 54a, 488—494 (1999); received June 7 1999 
  Published    1999 
  Keywords    NMR, Relaxation, Potential Energy 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0488.pdf 
 Identifier    ZNA-1999-54a-0488 
 Volume    54