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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 116 (1994), S. 101-109 
    ISSN: 1436-5073
    Keywords: infrared spectroscopy ; infrared reflection spectroscopy ; FT-IR ; conversion coating ; phosphate coating ; galvanized steel ; hopeite ; phosphophyllite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Hopeite-type phosphate coatings in which zinc is replaced by other metals like nickel, manganese and magnesium are of great interest as conversion coatings on galvanized steel in the automotive and appliance industries. The analytical characterization of such coatings produced in special processes is not possible by XRD because the different types of hopeite are isomorphic. In this paper it is shown that the kind of metal substitution is responsible for certain specific features in the infrared reflection spectra. Furthermore the structural changes caused by dehydration due to heating of the coatings were studied and differences in the thermal stability of the different coatings thus could be observed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 607 (1992), S. 26-28 
    ISSN: 0044-2313
    Keywords: Tetrakis(di-tert.-butylphosphino)diphosphane ; [(tBu)2P]2P—P[P(tBu)2]2 ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structure of Tetrakis(di-tert.-butylphosphino)diphosphane [(tBu)2P]2P—P[P(tBu)2]2[(tBu)2P]2P—P[P(tBu)2]2 1 obtained at -20°C from a solution of (tBu)2P—P=P(Br)tBu2 forms yellow crystals (regular hexagons). 1 crystallizes monoclinic in the space group C2/c with a = 2145.6pm, b = 1137pm, c = 1696.1pm, β = 110.075° and Z = 4 formula units in the elementary cell. Due to high steric load the bond angles at the tertiary P atoms with δ = 115.7° are significantly larger than those at the primary P atoms with δ = 108.6°.
    Notes: [(tBu)2P]2P—P[P(tBu)2]2 1 sich aus (tBu)2P—P(Br)tBu2 (toluolische Lösung, -20°C) und fällt als gelbe Kristalle (regelmäßige Sechsecke) aus. 1 kristallisiert monoklin in der Raumgruppe C2/c mit den Gitterkonstanten a = 2145,6pm, b = 1137pm, c = 1696pm, β = 110,75°. Die Elementarzelle enthält 4 Formeleinheiten. Die Bindungswinkel an den tertiären P-Atomen mit δ = 115,7° sind infolge der hohen sterischen Belastung der tert. P-Atome gegenüber denen an den primären P-Atomen mit δ = 108,6° deutlich aufgeweitet.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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