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'Aggregation' in keywords Facet   Publication Year 1985  [X]
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1985[X]
1Author    Mohamed Yalpani, WernerE. KlotzbücherRequires cookie*
 Title    Transformations in Thin Solid Layers: The Reversible Polymerization-Depolymerization of 2,6-Di-n-propyl- l,3>5,7-tetraoxa-2,6-dibora-4,8-octalindiones at Low Temperatures  
 Abstract    The course of Aggregation of molecules of the title compound (lb) through different, spectro-scopically discernible and chemically identifiable forms of associations could be followed by matrix isolation and thin film infrared and UV-visible spectroscopy. It was found that molecules of lb in thin films form clusters which at low temperatures interact weakly, probably through the carbonyl oxygens of one and the boron atoms of the neighbouring molecules. On warming to 260 K this association gradually takes the form of more defined chelate bonds, probably with ordered three-dimensional intermolecular structures. Above this temperature spontaneous for-mation of crystallites of the previously reported 'hot' and 'cold' modifications was observed. Studies with films of varying thickness indicate an interdependence of crystallite size and lattice energies. 
  Reference    Z. Naturforsch. 40b, 222—228 (1985); received September 24 1984 
  Published    1985 
  Keywords    Solid State Reaction, Matrix Isolation, Aggregation, Phase Transformation, Microcrystals 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0222.pdf 
 Identifier    ZNB-1985-40b-0222 
 Volume    40