Abstract
The photoexcitation of liquid solutions of 2-(2′-hydroxyphenyl)benzoxazole (HBO) in alkanes leads to a dual phosphorescence which can be assigned to the keto and enol forms of HBO. The keto-enol tautomerism in the metastable triplet state of HBO is practically independent of temperature. The keto and enol bands of the phosphorescence from HBO decay monoexponentially with the same rate constant. The experimental data on the phosphorescence from HBO are consistent with those on the transient absorption of HBO. At high triplet concentration and low solvent viscosity, a delayed fluorescence from HBO due to triplet-triplet annihilation is also observed.
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