Infrared Spectra of Difluoroborane and Difluoroborane-d

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Abstract
Gaseous H–BF2 and D—BF2 were obtained by a new method of preparation. Analysis of high-resolution ir spectra gave approximate values for the B–F distance (1.30±0.15 Å) and the F–B–F angle (120°±5°). Five of the six fundamentals were observed and assigned unambiguously: ν2 = 2620 and 1962 cm−1, B–H and B—D stretches; ν1 = 1166 and 1128 cm−1, 11B–F symmetric stretches in H–BF2 and D—BF2; ν3 = 545 and 540 cm−1, F–11B–F bending in H–BF2 and D—BF2; and ν4 = 1402, 1392, 1419 cm−1, 11B–F asymmetric stretches in H–BF2 and D—11BF2 and 10B–F stretch in D—10BF2, respectively; ν6 = 944, 924, 810, 790 cm−1, out-of-plane deformation in H–10BF2, H–11BF2, D—10BF2, and D—11BF2, respectively. The H–B–F bending appears to have a frequency ν5 = 1200 cm−1 for H–11BF2 and is estimated at 887 cm−1 for D—11BF2. A force-constant calculation was made, obtaining the following values (in millidynes per angstrom) : fD = 3.66, fd = 6.625, fd′ = 0.725, fDd = 0.37, fr = 0.772.

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