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  • 1
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 790-792 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The crystal structure of poly[copper(II)-di-μ-hypophosphito-μ-urea], [Cu(H2PO2)2(CH4N2O)]n, has been determined at 293, 100 and 15 K. The geometry of the hypophosphite anion is very close to ideal, with point symmetry mm2. Each Cu atom lies on an inversion centre and is coordinated to six O atoms from four hypophosphite anions and two urea molecules, forming a tetragonal bipyramid. The unique urea molecule lies on a twofold axis. Each hypophosphite anion in the structure is coordinated to two Cu atoms. The hypophosphite anions, urea molecules and CuII cations form polymeric ribbons. The CuII cations in the ribbon are linked together by two hypophosphite anions and a urea molecule, which is coordinated to Cu via an O atom. The ribbons are linked to each other by N—H...O hydrogen bonds and form polymeric layers.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1572-8943
    Keywords: solid-state kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Vorliegende Arbeit beschäftigt sich mit einigen Annahmen und Grenzen von “klassischen≓ Modellen, die in thermoanalytischen kinetischen Studien von Feststoffreaktionen verwendet werden.
    Notes: Abstract The paper deals with some of the assumtions and limitations of ‘classical’ models used in thermal analysis kinetic studies of solid-state rections.
    Type of Medium: Electronic Resource
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