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= 45.3 μs). The performances of FL and NI-FL in the photooxidation of sulfides in air were also examined. Apart from nearly quantitative selectivity for sulfoxide, NI-FL demonstrates a 0.5-5 fold enhanced performance with respect to FL and the conversion proceeds through radical intermediates formed by electron transfer at excited states with substrates. Mechanistic investigation satisfactorily explained the observed photophysical properties and the dominant role of radical intermediates in the NI-FL catalyzed photooxidation. The findings may help to understand photooxidation sensitized by FL derivatives and benefit the design of novel efficient photosensitizers.
Guo et al. (Sat,) studied this question.