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2000 (1)
1991 (1)
1Author    FrancisJ. BartisRequires cookie*
 Title      
 Abstract    This problem is reconsidered in the light of the mounting evidence that dislocations act as the centres of nucleation and growth. A new relation between the fraction of the sample in liquid form and the equilibrium temperature is derived and found to fit well the data on succinonitrile and N-p-ethoxybenzylidene-p'-butylaniline (EBBA). It is argued that the additional dislocations in a cyclopentyl-l-thiaethane sample after rapid crystallization are responsible for the greater breadth of its melting transition compared to that of the same sample following slow crystallization. Past studies of the fractional melting process are criticized for their failure to include the early stages of the transition in their comparison of theory and experiment. C o u r s e o f th e M e ltin g T r a n s itio n in O r g a n ic C o m p o u n d s 
  Reference    Z. Naturforsch. 46a, 630—634 (1991); received March 31 1990 
  Published    1991 
  Keywords    Melting, Latent heat, Organic compounds, Dislocations, Impurities 
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 TEI-XML for    default:Reihe_A/46/ZNA-1991-46a-0630.pdf 
 Identifier    ZNA-1991-46a-0630 
 Volume    46 
2Author    Shuan Dong, Kazuhiko Yamada, Gang WuRequires cookie*
 Title    Oxygen-17 Nuclear Magnetic Resonance of Organic Solids  
 Abstract    We report solid-state l7 0 NMR determinations of the oxygen chemical shift (CS) and electric field gradient (EFG) tensors for a series of 17 0-enriched organic compounds containing various functional groups. In several cases, analysis of the n O magic-angle-spinning (MAS) and static NMR spectra yields both the magnitude and relative orientations of the 17 0 CS and EFG tensors. We also demonstrate the feasibility of solid-state 17 0 NMR as a potentially useful technique for studying molecular structure and hydrogen bonding. 
  Reference    Z. Naturforsch. 55a, 21—28 (2000); received September 11 1999 
  Published    2000 
  Keywords    Oxygen-17, Solid State NMR, Organic Compounds, Chemical Shift Tensor, Quadrupole Coupling Constant 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0021.pdf 
 Identifier    ZNA-2000-55a-0021 
 Volume    55