Abstract
The molecular structure of gaseous SbF 3 and BiF 3 was determined by gas-phase electron diffraction. The principal geometrical parameters are r g ( SbF) 1.880 ± 0.004 A ̊ , r α( SbF) 1.876 ± 0.004 A ̊ , ∠ α FSbF 94.9 ± 0.2° and r g ( BiF) 1.987 ± 0.004 A ̊ , r α( BiF) 1.979 ± 0.004 A ̊ , ∠ α FBiF 96.1 ± 0.6°, respectively. They are consistent with the expected trends of geometrical variations in the Group 15 trihalide series, except for the bond angle of BiF 3. It is suggested that the highly ionic character of BiF 3 may be responsible for its larger than expected bond angle.
Published Version
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