Effect of the Electron-Vibrational Interaction on the Second Electron Transition of Tetraazaporphin and Tetraazachlorin Molecules |
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Authors: | S M Arabei K N Solov'ev E A Makarova |
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Institution: | (1) Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skorina Ave., Minsk, 220072, Belarus;(2) NIOPIK State Scientific Center of the Russian Federation, Moscow, Russia |
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Abstract: | We have traced the change in the complex structure of the intense 0–0 band of the electronic S
2 S
0 transition in the quasi-line absorption spectra (n-octane, 77 K) for individual types of impurity centers in the series of compounds tetraazaporphin–tetraazachlorin–di(tert-butylbenzo)barrelene-substituted tetraazachlorin. It has been concluded that the reason for the appearance of this structure is the interaction of the pure electronic S
2 state with the vibronic S
1 states rather than the Franck–Condon manifestation of low-frequency vibrations. Attempts to detect the short-wave S
2 S
0 fluorescence for all three compounds were unsuccessful. The reasons for the difference from the case of bacteriochlorin, in which such a fluorescence was observed earlier, are discussed. |
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Keywords: | tetraazaporphin tetraazachlorin di(tert-butylbenzo)barrelene-substituted tetraazachlorin quasi-line absorption spectrum electron-vibrational interaction |
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