The IR spectrum of borane(3) anions (BH3−) isolated in solid Ar was recorded; two vibrational modes were observed at 2259.4 and 606.6 cm−1, which were assigned to the BH2 stretching (ν3) and out-of-plane large-amplitude (ν2) modes, respectively. These anions were produced by the electron bombardment of an Ar matrix sample containing a small proportion of B2H6 and H2 during matrix deposition or by the photolysis of sbr-B2H5− in an Ar matrix with the selected UV light. The band positions, relative intensity ratios, isotopic splitting pattern, and isotopic shift ratios of the observed IR features of BH3− are generally in good agreement with those predicted by the B2PLYP/aug-cc-pVTZ method.

Formation and identification of borane radical anions isolated in solid argon

256th National Meeting (2018)

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