The picosecond time-resolved fluorescence and transient absorption behavior of piroxicam at room temperature are reported. The keto tautomer in the excited singlet state (^1K^*) formed via the fast intramolecular proton transfer (??20 ㎰) is observed...
The picosecond time-resolved fluorescence and transient absorption behavior of piroxicam at room temperature are reported. The keto tautomer in the excited singlet state (^1K^*) formed via the fast intramolecular proton transfer (??20 ㎰) is observed. The short-lived (7.5 ㎱) triplet state of keto tauomer (^3K^*) is generated from ^1K^* in toluene whereas it is hardly observed in ethanol. Consequently, rapid reverse proton transfer takes place from ^3K^* to the enol triplet state (^3E^*).