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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Russian chemical bulletin 41 (1992), S. 1384-1391 
    ISSN: 1573-9171
    Keywords: fluorophosphoranes ; phosphorus fluorides ; NMR ; pseudorotation ; restricted rotation ; rotational barrier ; hydrogen bonds ; conjugation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Phenomena associated with stereochemical nonrigidity of five-coordinate phosphorus fluorides (Berry pseudorotation and restricted rotation of different functional groups about the bond with the central phosphorus atom) have been analyzed. The main cause of restricted rotation isp π d π bonding of unsharedp-electron pairs of substituents with vacantd-orbitals of the phosphorus. Additional stabilization of the molecule occurs when it is possible to form an H...F hydrogen bond between the liquid and an axial fluorine atom in the phosphorane. The relationship between pseudorotation and restricted rotation is considered.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 26 (1993), S. 328-330 
    ISSN: 1434-6079
    Keywords: 35.80+s ; 68.10.Jy ; 82.65.Pa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The vibrational excitation of hydrogen molecules formed by recombination of hydrogen atoms on different metal surfaces has been studied. A recently developed experimental technique was used to determine vibrational state populations of the molecules up to v=7. Excitation of high vibrational levels is observed for molecules formed on metal surfaces which strongly chemisorb hydrogen. Metals with weaker chemisorption lead to vibrational excitation of lower levels, predominantly up to v=3. Knowledge of the vibrational state of desorbed molecules gives information on the energy of adsorbed hydrogen atoms and on the dynamics of surface reactions. This information is complementary to that obtained from studies of hydrogen reactions with metal clusters.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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