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An investigation of the solvent dependence on the ultrafast intersystem crossing kinetics of xanthone

✍ Scribed by Joseph J. Cavaleri; Katherine Prater; Robert M. Bowman

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
558 KB
Volume
259
Category
Article
ISSN
0009-2614

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✦ Synopsis

The photophysics of xanthone in solution are measured using femtosecond pump-probe techniques. A kinetic model which includes intersystem crossing from both the ~TrTr * and ln~r * electronic states accurately represents the non-single exponential growth of the triplet-triplet absorption after excitation into the ~zrzr * state at 310 nm. The inters~'stem crossing rate constants are consistent with an 'inverse' gap effect due to solvent polarity induced shifts in the electronic states. The branching between intersystem crossing from the Jzmr * and tnzr * electronic states is also solvent dependent and is determined by the rate constant for internal conversion in the singlet electronic state.

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