Abstract
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 S 2-state deactivation occurs in the hydrogen-bonded BPT–water complex. The lifetime of the complex in the S 2 state is found to be as short as 1.0 ± 0.1 ps in H 2O, and 2.2 ± 0.1 ps in D 2O.
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