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'Aggregation' in keywords
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2001 (1)
1990 (1)
1985 (1)
1Author    N. O. Rb, E. Rt, W. M. Itzel, Christian LustigRequires cookie*
 Title    Crystal Structure of a Lithium Chloride Cubane Cluster Solvated by Diethyl Ether  
  Reference    Z. Naturforsch. 56b, 443 (2001); received March 2 2001 
  Published    2001 
  Keywords    Lithium Chloride, Aggregation, Crystal Structure 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0443_n.pdf 
 Identifier    ZNB-2001-56b-0443_n 
 Volume    56 
2Author    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 
3Author    J. Schmidt, H. Gottstein, Scheer, A. ScherzRequires cookie*
 Abstract    Micellar aggregates have been prepared from chloro­ phyll a. Whereas most detergents including non-ionic, zwitterionic and anionic ones, produce aggregates with long-wavelength shifted and enhanced Q Y absorption, the cationic detergents hexadecyl-trimethylammonium-bromide and hexadecyl-pyridiniumchloride produce complexes with opposite traits: The Q Y absorption is shifted to shorter wavelengths, and it is hypochromic. The optical activity is increased as in the long-wave­ length shifted complexes, but the cd bands are non-con­ servative and coincide with the absorption maxima. The complexes are most likely small aggregates o f chloro­ phyll with a changed geometry as compared to the "standard" ones. 
  Reference    Z. Naturforsch. 45c, 729—732 (1990); received January 26 1990 
  Published    1990 
  Keywords    Chlorophyll, Micelles, Detergent, Aggregation, Absorp­ tion, Circular Dichroism, Molecular Orbital 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0729_n.pdf 
 Identifier    ZNC-1990-45c-0729_n 
 Volume    45