ISSN:
0044-2313
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Vapour Pressure of NbCl4 and NbBr4The vapour pressur of solid NbCl4 has been determined spectralphotometrically near 600 K: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm log}\,{\rm P}({\rm NbCl}_4,\,60{\rm 0}\,{\rm K})\, = \, - \frac{{5937}}{{\rm T}}\, + \,7.931.} \hfill \\ {\Delta {\rm H}^ \circ {\rm (subl}{\rm .,}\,{\rm 298}\,{\rm K)}\,{\rm = }\,{\rm 28696}\,{\rm cal/Mol;}\,\Delta {\rm S(subl}{\rm .,}\,{\rm 298}\,{\rm K)}\,{\rm = }\,{\rm 40}{\rm .10}\,{\rm eu;}} \hfill \\ {\Delta {\rm Cp}\, = \, - 6.1\, + \,0.9 \times \,10^5 {\rm T}^{{\rm - 2}} } \hfill \\ \end{array} $$\end{document}.NbCl4 is monomolecular in the gaseous state.In the same way the vapour pressure of NbBr4 has been found: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm log}\,{\rm P}({\rm NbBr}_4,\,626\,{\rm K})\, = \, - \frac{{6722}}{{\rm T}}\, + \,9.057 $$\end{document}.
Notes:
Der Sättigungsdruck von festem NbCl4 wurde spektralphotometrisch bei Temperaturen um 600 K gemessen: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm log}\,{\rm P}({\rm NbCl}_4,\,60{\rm 0}\,{\rm K})\, = \, - \frac{{5937}}{{\rm T}}\, + \,7,931.} \hfill \\ {\Delta {\rm H(subl}{\rm .,}\,{\rm 298}\,{\rm K)}\,{\rm = }\,{\rm 28696}\,{\rm cal/Mol;}\,\Delta {\rm S(subl}{\rm .,}\,{\rm 298}\,{\rm K)}\,{\rm = }\,{\rm 40,10}\,{\rm eu;}} \hfill \\ {\Delta {\rm Cp}\, = \, - 6,10\, + \,0,9\, \cdot \,10^5 {\rm T}^{{\rm - 2}} } \hfill \\ \end{array} $$\end{document}.Gasförmiges NbCl4 ist monomolekular.Auf gleiche Weise wurde der Sättigungsdruck von festem NbBr4 gemessen: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm log}\,{\rm P}({\rm NbBr}_4,\,626\,{\rm K})\, = \, - \frac{{6722}}{{\rm T}}\, + \,9,057 $$\end{document}.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19855220312
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