Reactions of borane (BH3). V. Mass spectrometric observation of the products of addition to diborane(L) and pentaborane(9)

Abstract

The reaction of BHs with 2 ß and B5H9 in the gas phase has been examined utilizing a fast-flow system with mass spectrometric analysis. The addition products have been identified from their mass spectra, their phase spectra, variation in the reaction time, and variation in the reactant partial pressures. BHs reacts with B2H6 to produce a triborane while BH3 reacts with B5H9 to produce a hexaborane. The relevance of these results to the interconversions of the boron hydrides is discussed.Many investigators have shown that the formation of several of the higher hydrides of boron is consistent with a mechanism which involves borane (BH3) addition to a stable hydride followed by hydrogen loss.1,2 The essence of such a mechanism can be represented by the general reactions B"H"+4 + BHs-> B"+1H"+7

BH3 under Pressure: Leaving the Molecular Diborane Motif

“…Step II, the formation of a B 3 H 9 trimer, has not been unambiguously characterized in experiments. Fridmann and Fehlner observed the formation of a triborane product, suggested to be B 3 H 9 , in the reaction of BH 3 and B 2 H 6 . Theoretical calculations suggested that the step II is associated with activation and reaction enthalpies (at 400 K) of approximately 14 and −5 kcal/mol, respectively.…”

Reactions of borane (BH3). VII. Reactions with ketene

“…In contrast, aliene, which is isoelectromc with ketene, produces easily visible high-mass products. 19 These facts indicate that BC2-H50 contains tetracoordinate boron. However, this evidence does not distinguish between a ketene-borane donor-acceptor adduct and a tricoordinate boranc with an internal donor-acceptor interaction, e.g.…”

Comparative study of thermal and radical-enhanced methods for growing boron nitride films from diborane and ammonia

“…The gas-phase decomposition of B 2 H 6 was studied by many researchers. [102][103][104][105][106][107][108][109] On the surface, B 2 H 6 is known to cause a non-self-limiting formation of solid boron. [109][110][111][112] The studies of Fehlner, [113][114][115][116] Baylis et al, 117 and Söderlund et al 118 suggested that BH 3 species dominate in the gas phase.…”