Abstract
The dicoordinated borinium ion, dihydroxyborinium, B(OH) 2 + is generated from methyl boronic acid CH 3B(OH) 2 by dissociative electron ionization and its connectivity confirmed by collisional activation. Neutralization–reionization (NR) experiments on this ion indicate that the neutral B(OH) 2 radical is a viable species in the gas phase. Both vertical neutralization of B(OH) 2 + and reionization of B(OH) 2 in the NR experiment are, however, associated with particularly unfavorable Franck-Condon factors. The differences in adiabatic and vertical electron transfer behavior can be traced back to a particular π stabilization of the cationic species compared to the sp 2-type neutral radical. Thermochemical data on several neutral and cationic boron compounds are presented based on calculations performed at the G2 level of theory.
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