The molecular structure of SbI3 and BiI3 have been studied by gas-phase electron diffraction and infrared spectroscopy, BiI3 has been studied by electron diffraction, and SbI3 has been studied by infrared spectroscopy for the first time. Both molecules are pyramidal (C3v symmetry), and their geometries are characterized by the following bond lengths (rg) and bond angles (Zα): Sb-I 2.721 ± 0.005 Å, I-Sb-I 99.0 ± 0.3°, Bi-I 2.807 ± 0.006 Å, and I-Bi-I 99.5 ± 0.3°. Three of the four normal modes of vibration were observed for both molecules: SbI3, V2 = 74.4 cm-1, v3 = 193.6 cm-1, and v4 = 54.6 cm-1 BiI3, v2 = 59.7 cm-1, v3 = 163.5 cm-1, and V4 = 47.0 cm-1. A joint electron diffraction/vibrational spectroscopic analysis was also carried out, from which the harmonic equilibrium geometries were estimated. Force field parameters from a normal coordinate analysis are reported for both molecules.
|Number of pages||4|
|Publication status||Published - Dec 1 1996|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry