We leveraged the low dielectric constant of the fluorous phase to improve the photophysical properties of a fluorous pentamethine dye (FCy5) via counterion exchange. We found that larger aryl borate counterions promote charge delocalization across the polymethine chain and increase the photostability (55-fold) and brightness (6-fold) of FCy5.
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Lin et al. (2024) studied this question.
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