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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: Photoelectron Spectra of Group V Compounds. VIII. Stiboranes Me3SbX2 (X = Me, Cl, Br, I) and SbCl5  -  Compared with Group Vb Analogs TaMe5, TaCl5, and NbCl5The gas phase HeI photoelectron spectra of Me5Sb, Me3SbCl2, Me3SbBr2, Me3SbI2, and SbCl5 are assigned on the basis of a qualitative D3h m. o. model and by comparison with the p. e. data of Me3Sb and SbCl3. The type of the three-centre-four-electron bond of the model compound SbH5 is discussed with respect to the axial bond of a typical sp3d molecule. The highest occupied m.o. of Me5Sb has non-bonding character; d-orbital participation may be excluded PE-spectroscopically. The differences between iso(valence)-electronic analogs EX5 of groups Va and Vb are investigated by means of the known p. e. ionisation potentials of TaMe5, TaCl5, as well as of NbCl5; their p. e. spectra are correlated. EHMO calculations for SbH3, H3SbHal2, SbH5, and NbH5 are performed to confirm the assignments and the interpretation.
    Notes: Die Gasphasen-HeI-Photoelektronenspektren von Me5Sb, Me3SbCl2, Me3SbBr2, Me3SbI2 und SbCl5 werden nach einem qualitativen MO-Modell für D3h-Systeme und durch Vergleich mit den PE-Daten von Me3Sb und SbCl3 zugeordnet. Der Typ der axialen Dreizentren-Vierelektronen-Bindung wird am Modell SbH5 vorgestellt und dem des sp3d-Moleküls gegenübergestellt. Übereinstimmend damit ist das oberste besetzte MO von SbMe5 nichtbindend; nach PE-Daten ist eine d-Orbitalbeteiligung nicht anzunehmen. Die Unterschiede zwischen isovalenzelektronischen Analoga EX5 der Gruppen Va und Vb werden anhand literaturbekannter Ionisierungsenergien von TaMe5, TaCl5 und NbCl5 untersucht, ihre PE-Spektren korreliert. EHMO-Rechnungen an SbH3, SbH3Hal2, SbH5 und NbH5 bestätigen Zuordnung und Interpretation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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