Electronic spectra and vibronic coupling of pyrazine |
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Authors: | Isamu Suzuka Naohiko Mikami Mitsuo Ito |
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Institution: | Department of Chemistry, Faculty of Science, Tohoku University, Sendai, Japan |
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Abstract: | The absorption and fluorescence spectra of pyrazine have been observed in vapor, solution and crystal, and the vibrational structures have been analyzed in detail. The fluorescence spectrum consists of long progressions of the nontotally symmetric vibration ν5(b2g), and the absorption spectrum contains also the progression of the corresponding excited state vibration ν′5(b2g. However, the pattern of the latter progression is unusual because of the highly anharmonic nature of the potential of the 1B3u state, which may be expressed by a functional form containing a quadratic term in the normal coordinate. All the experimental results suggest that the known vibronic interaction between the state and the state through the vibration ν2(b2g) is strong. The vibronic coupling and the potential of the 1B3u state were found to be very sensitive to solvent. |
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