VIBRATIONAL OVERTONE SPECTROSCOPY OF PYRIDINE AND RELATED COMPOUNDS
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Date
1995
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Ohio State University
Abstract
Vibrational overtone spectra have been observed for pyridine, fluoro- and chlorosubstituted pyridines, and pyrazole. The overtone spectrum of pyridine consists of a progression of two peaks at each overtone level. Spectra of 3-fluoropyridine and 2,6-difluoropyridine show similar progressions of two peaks. Multiple transitions are also observed in the third overtone CH stretch spectra of 3,4,5-trichloropyridine, 3,5-dichloropyridine, and pyrazole. In earlier local mode $analyses^{1,2}$ of the liquid phase overtone spectrum of pyridine the two peaks were assigned to the $C_{\alpha}-H$ and $C_{\beta, \gamma}-H$ stretches. However, this local mode assignment is not sufficient to explain our results, in particular the observation of two peaks in the third overtone spectrum of 3,4,5-trichloropyridine and four peaks in the third overtone spectrum of 3,5-dichloropyridine.
Description
1. R. Bini, P. Foggi, and R.G. Della Valle, J. Phys. Chem. 95, 3027 (1991). 2. M. Katayama, K. Itaya, T. Nasu, J. Sakai, J. Phys. Chem. 95, 10592 (1991).
Author Institution: Bowling Green State University, Bowling Green OH 43403
Author Institution: Bowling Green State University, Bowling Green OH 43403