Vibrational Overtone Spectroscopy of Cyclic Amines: Pyridine and Related Compounds
BOWLING GREEN STATE UNIV OH CENTER FOR PHOTOCHEMICAL SCIENCES
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The vibrational overtone spectra of gaseous pyridine, 2,6- difluoropyridine, and pyrazole have been recorded using photoacoustic absorption spectroscopy. The pyridine overtone spectrum shows a progression of two peaks at each vibrational level. The widths of the overtone absorptions are compared to the known peak widths in the overtone spectrum of benzene. The spectrum has been analyzed in terms of a local mode model and, taken separately, the two peaks fit well to a Birge-Sponer plot. The v4 overtone spectrum of 2,6-difluoropyridine is similar to that of pyridine but the peaks are shifted to higher energy. The presence of two peaks in this spectrum refutes a previous assignment of the liquid pyridine overtone spectrum in which the two peaks were attributed to structurally different C-H oscillators in the molecule. The overtone spectrum of pyrazole also shows two peaks.
- Organic Chemistry
- Physical Chemistry