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  • Title: Spectral and photophysical properties of thioxanthone in protic and aprotic solvents: the role of hydrogen bonds in S1-thioxanthone deactivation.
    Author: Krystkowiak E, Maciejewski A, Kubicki J.
    Journal: Chemphyschem; 2006 Mar 13; 7(3):597-606. PubMed ID: 16514691.
    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.
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