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'Chlorine N Q R' in keywords Facet   Publication Year 1994  [X]
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1Author    Masao Hashimoto, Shuji Matsumoto, Masakazu Kunitomo, Haruo Niki, Hirotaka Odahara, Katsuji TamakiRequires cookie*
 Title    35C1 NQR Relaxation and Hydrogen Bond in Some Chloral Hemiacetals  
 Abstract    The crystal structure of chloral ethylhemiacetal has been determined at 291 K: monoclinic, space group C f -P 2 lt Z = 2, a = 854.5(1), b = 594.0(3), c = 853.3(1) pm, ß = 108.30(2)°, R = 0.0962. A sharp decrease of the spin lattice relaxation time 7i found for the 35C1 N Q R o f the CC13 groups in chloral methyl-, ethyl-and n-heptylhemiacetals is attributed to the onset of reorientation of the group over a potential barrier o f ca. 39, 37, and 32 kJ/m ol, respectively. An unusual vs. 1/T curve with a 7i minimum superimposed on the sharp decrease of 7\ due to the reorientation was observed for each of the three Cl N Q R lines of nH p-C H . This phenom enon is tentatively ascribed to a fluctuation of EFG caused by jum ping m otion o f the hydrogen atom s in the OH groups. 
  Reference    Z. Naturforsch. 49a, 279 (1994); received August 16 1993 
  Published    1994 
  Keywords    Crystal structure, Hydrogen bond, Chlorine N Q R, Spin lattice relaxation 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0279.pdf 
 Identifier    ZNA-1994-49a-0279 
 Volume    49 
2Author    J. Pirnat, J. Lužnik, Z. Jagličić, Z. TronteljRequires cookie*
 Title    Dehydration of Solid SnCl2(O H 2) * H 20 to SnCl2  
 Abstract    The temperature and flow rate dependence of the dehydration of SnCl2(O H 2) • H 20 , having a layered structure, into SnCl2 in a dry inert gas stream is studied. The experimental results obtained via chlorine N Q R and weight measurements are analysed in the light of the structural transforma­ tion of this compound. The mechanism of water depletion from the layered structure is discussed. 
  Reference    Z. Naturforsch. 49a, 367—372 (1994); received August 14 1993 
  Published    1994 
  Keywords    Structural transformation, Chlorine N Q R, Crystal water, Dehydration modelling, Layered structures 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0367.pdf 
 Identifier    ZNA-1994-49a-0367 
 Volume    49