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  • 1
    Electronic Resource
    Electronic Resource
    Homogeneous isotope exchange between tungsten(VI) and Keggin and Dawson type uranium polyoxotungstophosphates (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 242 (1999), S. 119-122 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The present paper is concerned with the isotope exchange between185W and tungsten, and32P and phosphorus respectively, in uranium(IV) trivacant Keggin and Dawson polyoxotungstophosphate complexes, in water. These studies were carried out at different concentrations and temperature. The isotope exchange rate increases with the temperature and the reagents' concentration. The experimental results show that the complexes are labile kinetically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02345903
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Keggin Polyoxotungstoborate with Uranium(IV) (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 245 (2000), S. 363-366 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A new uranium tungstoborate heteropolyanion K12[U(BW11O39H)2]·23 H2O has been prepared and investigated by thermal analyses, IR, UV-Vis spectroscopy and magnetic susceptibility measurements. The compound obtained from Keggin monolacunary anions is 1:2 sandwich-type and exhibits a square antiprismatic stereochemistry for uranium (IV) ion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006778909193
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  • 3
    Electronic Resource
    Electronic Resource
    Uranium(IV) polyoxotungstophosphates (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 242 (1999), S. 467-472 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Two tris(oxouranium)-substituted Keggin and Dawson sandwich-type tungstophosphate heteropolyanions Na12[(UO)3(H2O)6(PW9O34)2]·21 H2O (1) and Na18[(UO)3(H2O)6(P2W15O56)2]·27 H2O (2) have been prepared by reaction of uranium sulphate with [PW9O34]9− and [P2W15O56]12−, respectively, in aqueous media at 4.7 pH. The products were characterized by elemental and thermal analyses, IR, UV-Vis spectroscopy and magnetical susceptibility. The results of these studies suggest that the compounds obtained from Keggin and Dawson trilacunary anions are 2∶3 sandwich-type complexes and both exhibit a square antiprismatic stereochemistry for uranium(IV) with retention of polyoxometallate parent structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02345579
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Small-angle scattering of polarized light. VI. Sphere doublets at rest and during shear (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 2005-2013 
    Details
    ISSN: 0887-6266
    Keywords: sphere doublets ; light scattering ; suspension ; flow ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The polarized or depolarized light scattering by well-defined monodispersed sphere doublets is investigated. Two configurations of doublets are studied. In the first (at rest) the doublets are randomly oriented in a plane, in the second the doublets are oriented in a preferred direction. This is achieved by submitting a suspension of doublets to a shear flow. The scattering patterns are compared to two theoretical predictions based on simplified geometries. In the first approach, the doublet is approximated by two interpenetrating spheres scattering independently, whereas in the second, an ellipsoid geometry is used. A good qualitative comparison is obtained. However, the HV and VH patterns of a randomly dispersed suspension are not similar. The observation of the flow of a doublet suspension in shear shows that the doublets are spiraling around the vorticity axis. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 2005-2013, 1998
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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