Abstract
The i.r. and Raman spectra of C 7H 7PCl 6 in both solid state (at 300 K and 100 K) and solution have been studied in the 4000-30 cm −1 range. For the first time, all normal modes of the C 7H + 7 cation have been observed and a complete assignment of vibrations in the D 7 h group symmetry is proposed. A normal coordinate analysis has been performed and the valence force constants have been calculated: both aromatic systems C 7H + 7 and C 6H 6 are compared. The spectroscopic results are consistent with the ionic character of this tropylium salt.
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