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  • Chemistry  (1)
  • Condensed Matter: Electronic Properties, etc.
  • 1980-1984  (1)
  • 1981  (1)
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  • 1980-1984  (1)
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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: PE Spectra and Molecular Properties. 89. Ionisation Patterns and Conformation of Cyclo Polythianes (H2CS)nCyclopolythianes (H2CS)n (n = 3, 4, 5) show characteristic low-energy ionization patterns, which are assigned to radical cation states with predominant sulfur lone pair contributions, and the correlation of which with topological eigenvalues ∊JHMO of a perimeter model exhibit the rather low standard deviation of only 0.08 eV. This finding suggests that the sulfur lone pairs should be equivalent on time-averaging. Geometry-optimized SCF calculations concerning preferred conformations as well as molecular flexibility of cyclopolythianes (H2CS)3 and (H2CS)4 in the gaseous phase, yield low barriers for transition between tub and chair conformers and also eigenvalue-sets which correlate with the PE data.
    Notes: Cyclopolythiane (H2CS)n (n = 3, 4, 5) besitzen im niederenergetischen Bereich charakteristische Ionisationsmuster, die Radikalkation-Zuständen mit überwiegendem Schwefelelektronenpaar-Anteil zuzuordnen sind, und deren Korrelation mit den topologischen Eigenwerten ∊JHMO eines Perimeter-Modells die geringe Standardabweichung von nur 0,08 eV aufweist. Dieser Befund legt nahe, daß im zeitlichen Mittel die Schwefel-Elektronenpaare äquivalent sein sollten. Geometrieoptimierte MNDO-Rechnungen über Vorzugskonformationen und zur Molekülbeweglichkeit von Cyclopolythianen (H2CS)3 und (H2CS)4 in der Gasphase ergeben niedrige Barrieren für die Übergänge zwischen Wannen- und Sessel-Formen und zugleich Eigenwert-Schemata, welche sich mit den PE-Daten korrelieren lassen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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