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Abstract The singlet oxygen quantum yield (ϕ 1 o 2 ) of 11 purified fluorescein derivatives was determined by reaction with singlet oxygen acceptors in aqueous and ethanolic solutions; in both solvents ϕ 1 o 2 was enhanced with increasing halogenation. Tryptophan and 2,2,6,6‐tetramethylpiperidone were found to be unadapted for the determination of ϕ 1 o 2 , in our systems; however, the use of 9.10‐dipropionic anthracene acid andp‐nitrosodimethylaniline in conjunction with imidazole derivatives was suitable for 1 O 2 detection in water. Both methods lead to results in excellent agreement. As in ethanol. ϕ 1 o 2 , was equal to the triplet state quantum yield (ϕ T ), the comparison between the two solvents showed that ϕ T in water was greater than in ethanol. The comparison between our values obtained with polychromatic light with published data obtained with monochromatic light suggests that the triplet quantum yield of fluorescein derivatives is wavelength independent.
Gandin et al. (Tue,) studied this question.