We have studied for the first time the photophysics of the thioketone, 4H-1-benzopyrane-4-thione (BPT), in water and deuterated water, by using femtosecond fluorescence up-conversion and transient absorption spectroscopies. We propose that the S2-state deactivation occurs in the hydrogen-bonded BPT-water complex. The lifetime of the complex in the S2state is found to be as short as 1.0±0.1 ps in H2O, and 2.2±0.1 ps in D2O. © 2004 Elsevier B.V. All rights reserved.
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