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The fluorescence quantum yield (Φf), fluorescence lifetime (τf), intersystem crossing quantum yield (Φisc) and redox potentials of seven halogenated fluoresceins in their dianion forms were measured and compared in methanol to get a deep insight into the effect of halogeno atoms on their photophysics. It is found that the heavy atom effect alone cannot explain the experimental results, as (1) Φf for...