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  • Inorganic Chemistry  (1)
  • Humans
  • 1965-1969  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 352 (1967), S. 258-264 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The enthalpies of formation of the solid halides NbBr5 and NbJ5 were measured in a solution calorimeter. As reference value we used δHº(NbCl5). Results: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} \Delta{\rm H}^0 ({\rm NbBr}_{\rm 5},\,298) = - 134.6\,(\pm \,1)\,{\rm Kcal}/{\rm mol} \\ \Delta{\rm H}^0 ({\rm NbJ}_5,\,298) = - 64.6\,(\pm 1)\,{\rm Kcal}/{\rm mol}. \\ \end{array} $$\end{document} Using the Born-Haber cycle and the structures of the pentahalides, values were derived for the enthalpy of formation of TaJ5, Δ Hº(TaJ5, 298) = -70 kcal/mol, and for the ionisation energy of Ta, J(Ta0→5) = 136 eV.
    Notes: Die Bildungsenthalpien für die festen Halogenide NbBr5 und NbJ5 wurden im Lösungs-kalorimeter bestimmt. Als Bezugsgröße diente δHº(NbCl5). Ergebnisse: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} \Delta{\rm H}^0 ({\rm NbBr}_{\rm 5},\,298) = - 134,6\,(\pm \,1)\,{\rm Kcal}/{\rm Mol} \\ \Delta{\rm H}^0 ({\rm NbJ}_5,\,298) = - 64,6\,(\pm 1)\,{\rm Kcal}/{\rm Mol}. \\ \end{array} $$\end{document} Unter Berücksichtigung des Born-Haberschen Kreisvorgangs und der Pentahalogenidstrukturen ergeben sich gute Näherungswerte für die Bildungsenthalpie von TaJ5, ΔHº(TaJ5, 298) = -70 kcal/Mol, und für die Ionisierungsspannung des Tantals J(Ta0→5) = 136 eV.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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