The complete mass spectrum of pentaborane-d9 and a partial mass spectrum of pentaborane-d8 have been calculated from the spectra of a series of samples of different hydrogen content. The vapor pressure for pentaborane-d9 containing 3.9% of the B5D8H species can be expressed by the equation log10Pmm=9.46916 — 0.0028783T — 1870.70/T over the temperature of — 25°C to +56°C. The melting point is — 47.0°C. By way of comparison the vapor pressure equation for pentaborane is log10Pmm=9.49191 — 0.0028956T — 1881.29/T; the melting point is — 46.8°C.
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Shapiro et al. (1957) studied this question.
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