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Inne
Effect of solvent polarity on photophysical parameters of 3-aminoflavone.
Autorzy
Rok wydania
2011
Czasopismo
Journal of Photochemistry and Photobiology A-Chemistry
Numer woluminu
224
Strony
62-67
DOI
10.1016/j.jphotochem.2011.09.007
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Photophysical behavior of 3-amino flavone (3AF) in different media has been studied using steady state and time-resolved fluorescence spectroscopy in combination with DFT and TD DFT B3LYP/6-31G (d,p) calculations involving the ground and the excited state geometry optimization. Comparison of experimental solvatochromic shifts with the calculated energies in different solvents (PCM model) allows to conclude that the excited state of 3AF, corresponding to the π → π* (S0 → S1) transition, has a partial CT nature. The lifetime and quantum efficiency measurements in function of solvent polarity shown that in weakly polar solvents the radiationless rate constant is very high. On the basis of TD DFT calculations for singlet and triplet state distribution in different environments (PCM model) we hypothesize that in weakly polar solvents the intersystem crossing may be a prevailing relaxation process.
Słowa kluczowe
3-Amino flavone, Fluorescence, DFT and TD DFT calculations, PCM model, electron transfer, Lifetimes, CT states, Triplet states
Adres publiczny
https://doi.org/10.1016/j.jphotochem.2011.09.007
Strona internetowa wydawcy
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