Abstract
Quasiline fluorescence and fluorescence-excitation spectra of tetraazaporphin and its N-deuterated derivative in n-octane at 77 K have been investigated, and the frequencies of normal vibrations in electronic states S 0 and S 1 have been determined. Calculation of normal vibrations of these molecules has been done and, on its basis, the experimental data are interpreted. It is shown that in the spectra, predominantly the totally symmetric vibrations of type A g symmetry of the point D 2h symmetry group are active. Some activation of the nontotally symmetric B 1g vibrations in the fluorescence-excitation spectra is explained by the nonadiabatic interaction of the vibrational sublevels of the excited electronic state S 1 with the purely electronic level S 2.
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Gladkov, L.L., Shkirman, S.F., Konstantinova, V.K. et al. Calculation of Normal Vibrations of the Tetraazaporphin Molecule and Interpretation of Quasiline Spectra. Journal of Applied Spectroscopy 67, 755–762 (2000). https://doi.org/10.1023/A:1004109210759
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DOI: https://doi.org/10.1023/A:1004109210759