Vapour-density determinations on the saturated vapours of NbF5, TaF5, and SbF5 at temperatures above their boiling points have been made by a modified Dumas method. The average molecular weights of the vapour-phase species near the boiling points are close to those for the respective trimers. Approaching 400 °C (or 300 °C for SbF5), however, the major constituent of the vapour is the monomeric pentafluoride.
J. Fawcett, A. J. Hewitt, J. H. Holloway and M. A. Stephen, J. Chem. Soc., Dalton Trans., 1976, 2422 DOI: 10.1039/DT9760002422
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