Spectral and photophysical properties of thioxanthone in protic and aprotic solvents: the role of hydrogen bonds in S1-thioxanthone deactivation

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Ewa KrystkowiakJacek Kubicki

Abstract

Spectral and photophysical properties of thioxanthone (9H-thioxanthen-9-one, TX) were determined in a few protic solvents (H2O, D2O, hexafluoro-2-propanol) and compared with those in aprotic solvents. On the basis of the time-resolved and steady-state emission measurements and available literature data, it has been shown that the dominant S1-TX deactivation process in protic solvents is the formation of the S1-complex. The important modes of deactivation of the S1-complex are fluorescence (phiF approximately 0.4-0.5) and intersystem crossing to the T1 state. The S1-complex-->S0 internal conversion plays, at most, an insignificant role in S1-complex deactivation, which is evidenced by the absence of an isotope effect of protic solvents on the lifetime and quantum yield of fluorescence.

Citations

Jun 30, 2011·The Journal of Physical Chemistry. a·Vidisha Rai-ConstapelChristel M Marian
May 27, 2011·The Journal of Physical Chemistry. a·Rishikesh Pandey, Siva Umapathy
Jul 19, 2012·The Journal of Physical Chemistry. a·Rishikesh Pandey, Siva Umapathy
May 25, 2012·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Ewa KrystkowiakAndrzej Maciejewski
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Mar 21, 2018·Chemical Reviews·Thomas J PenfoldChristel M Marian

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