A theoretical and experimental study of the excited state relaxation properties of mono-aza- and di-aza-trans-stilbenes
- Istituto di Fotochimica e Radiazioni d'Alta Energia del C.N.R., 40129 Bologna (Italy)
A theoretical and photophysical study of the three isomeric trans-n-styryl-pyridines (n-StP with n=2,3,4) and the three symmetrical 1,2-dipyridyl-ethylenes (n,n'-DPE with n,n'=2,2', 3,3' and 4,4') has been carried out to evaluate the role of internal conversion (IC) on their deactivation pathways from the singlet manifold. The rate constants for IC have been obtained by quantum mechanical calculations. The fluorescence lifetimes measured in the picosecond time range and the fluorescence and trans{yields}cis photoisomerization quantum yields from the present and previous works allowed the rate constants for the relaxation processes to be calculated. The experimental results were in a reasonable agreement with the theoretical predictions on the role of IC (markedly more important for the ortho and para aza-derivatives). The study of the effects of temperature and solvent on the spectral properties and the photophysical and photochemical parameters allowed a better understanding of the excited state behavior of these aza-stilbenes in the singlet manifold.
- OSTI ID:
- 21163621
- Journal Information:
- AIP Conference Proceedings, Vol. 364, Issue 1; Conference: 54. international meeting of physical chemistry: Fast elementary processes in chemical and biological systems, Villeneuve d'Ascq (France), 26 Jun - 1 Jul 1995; Other Information: DOI: 10.1063/1.50191; (c) 1996 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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