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  • Chemistry  (2)
  • 1
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Series of 4′-subsituted 4-dimethylamino trans-stilbenes 1-5 was investigated by UPS, in connection with conjugated donor-acceptor substituted double bond photochemistry. The measured and assigned spectra indicate a high sensitivity, depending on the changed electronic structure by 4′-substituents of compounds 1-5. Correlation of ionization energies in LFE-relationship with Hammett's σp-values and other ground state data was proved, demonstrating UPS a powerful tool for substituent effect studies in conjugated double bond systems.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 496 (1983), S. 143-146 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tetramesitylübergangsmetall-Verbindungen: Photoelektronenspektroskopische Charakterisierung der elektronischen Struktur der Molybdän(IV)- und Molybdän(V)-DerivateDie d2-Konfiguration des Molybdänatoms in MoMes4 (Mes = 2,4,6-(CH3)3C6H2) wurde durch UP- (in Gasphase) und XP-Spektroskopie (in festem Zustand) untersucht, wobei sich die Effekte einer statischen Strukturverzerrung der tetraedrischen Ligandenanordnung und der entsprechenden σ- und π-Wechselwirkungen bemerkbar machen. Wie für typische MoIV-Verbindungen zu erwarten, betragen die Bindungsenergien im MoMes4 für die 4d- und 3d5/2-Zustände 6,4 eV (i. Mittel) bzw. 229,7 eV, während [MoMes4]+I3- eine beträchtliche Verschiebung des 3d5/2-Signals bis zu 232,0 eV aufweist, was auf schwache Madelung-Wechselwirkung in der festen Verbindung zurückgeführt wird.
    Notes: The d2 configuration of Mo in MoMes4 (Mes = 2,4,6-(CH3)3C6H2) is characterized by gas-phase UP and solid-state XP spectroscopic measurements giving evidence for a static splitting related to the typical D2d distortion of pseudotetrahedral tetra-σ-carbon bonded transition elements, and the consequent σ and π bond effects. Bond energies of ca. 6.4 eV (av.) and 229.7 eV are reported for MoMes4, respectively for 4d and 3d5/2, in the range normaly observed for MoIV compounds, whereas [MoVMes4]+I3- has a considerable high-energy shift on the 3d5/2 signal, to 232.0 eV, possibly related to weak Madelung interactions in the solid-state structure.
    Type of Medium: Electronic Resource
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