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  • Inorganic Chemistry  (1)
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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Photoelectron Spectrum of 1,1-Diethoxy-3,3-bis(trifluoromethyl)allene. The Effect of Trifluoromethyl Groups on Cumulative SystemsThe He(I) photoelectron(PE) spectra of 1,1-diethoxy-4,4,4-trifluoro-3-(trifluoromethyl)-1,2-butadiene [1,1-diethoxy-3,3-bis(trifluoromethyl)allene] (1), tetraethoxyallene (3), and tetrakis-(trifluoromethyl)allene (5) have been recorded. A comparison between the PE spectra of 1, 3, and 5 shows that the first band of 1 (8.93 eV) is due to an ionization from the diethoxyethylene fragment and the second band of 1 (11.0 eV) is due to ionization from the bis(trifluoromethyl)-ethylene fragment. The effect of CF3 groups has also been discussed by comparing the PE spectra of bis(trifluoromethyl)ketene (6) and bis(trifluoromethyl)thioketene (7) with the parent compounds. The interpretation is aided by comparing the measured ionization potentials with orbital energies derived from a MINDO/3 or MNDO calculation.
    Notes: Die He(I)-Photoelektronen(PE)-Spektren von 1,1-Diethoxy-4,4,4-trifluor-3-(trifluormethyl)-1,2-butadien [1,1-Diethoxy-3,3-bis(trifluormethyl)allen] (1), Tetraethoxyallen (3) und Tetrakis-(trifluormethyl)allen (5) wurden gemessen. Der Vergleich zwischen den PE-Spektren von 1, 3 und 5 zeigt, daß das 1. Ionisationspotential von 1 (8.93 eV) der Ionisation aus dem Diethoxyethylen-Fragment, das 2. Ionisationspotential von 1 (11.0 eV) der Ionisation aus dem Bis(trifluormethyl)ethylen-Fragment entspricht. Der Effekt der CF3-Gruppen wird zusätzlich anhand eines Vergleichs der PE-Spektren von Bis(trifluormethyl)keten (6) und Bis(trifluormethyl)thioketen (7) mit den unsubstituierten Verbindungen diskutiert. Die Interpretation erfolgt durch Vergleich zwischen den gemessenen Ionisationspotentialen und berechneten Orbitalenergien nach der MINDO/3-oder MNDO-Methode.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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