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Abstract
The UV absorption and fluorescence spectral bands of 2-benzoxazolinone and 6-methoxy-2-benzoxazolinone have been recorded in solution at room temperature. The phosphorescence spectral bands, their Quantum yields and mean life times, have been measured in solution of ethanol at 77 K. Whilst internal conversion does not compete with fluorescence in these compounds, an efficient intersystem crossing in the triplet state occurs in a nonradiative pathway to ground state with a low phosphorescence quantum yield.