Mass-Spectrometric Studies of the Synthesis, Energetics, and Cryogenic Stability of the Lower Boron Hydrides

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Abstract
Ionization‐efficiency measurements on species produced in the pyrolysis of B2H6 have led to A (B+), A (BH+), A (BH2+), A (BH3+), and A (B2H5+) from B2H6 and to A (B+), A (BH+), A (BH2+), and I (BH3) from BH3. These experimental results have permitted a rather complete development of the energetics of the BH3; B2H6 system and its related radicals and ions, including the important symmetric dissociation energy, D (BH3–BH3), which was found to be 2.56 eV. BH2 was not observed in these experiments and thermodynamic and kinetic arguments, using the results of this investigation, predict that BH2 should be of little significance in the pyrolysis mechanism. Using a cryogenically cooled mass‐spectrometric system the existence of BH3 and BH2F as stable cryochemicals was explored at temperatures down to 55°K with negative results.