Microwave spectrum and structure of difluoro(trifluorosilyl)borane, SiF3BF2
- 1 January 1983
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 79 (7) , 1089-1106
- https://doi.org/10.1039/f29837901089
Abstract
The microwave spectrum of 28SiF3 11BF2 has been thoroughly examined in the region 24–40 GHz. Transitions have been assigned within the five lowest-lying torsional states and the earlier analysis of the spectrum refined. An improved value for the barrier to internal rotation about the Si—B bond has been determined as V6= 2.178 ± 0.005 cal mol–1(9.11 ± 0.02 J mol–1). The spectra of the isotopic species 28SiF3 10BF2 and 29SiF3 11BF2 have also been assigned allowing the zero-point average Si—B bond length to be determined as 2.027 ± 0.005 Å, significantly longer than that expected for a single bond. The remaining rz structural parameters are determined to be: Si—F = 1.567 ± 0.005 Å, B—F = 1.312 ± 0.005 Å, ∠FBF = 118.5 ± 0.5°, ∠FSiB = 110.9 ± 0.2°. The structure and bonding of SiF3BF2 are compared with those of related molecules.Keywords
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