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We describe fluorescence detection of 1O2 by a new strategy. Oxidation of a non-fluorescent sulfoxide by 1O2 occurs via intramolecular oxygen atom transfer in a reactive persulfoxide intermediate. The resulting sulfone shows significantly enhanced (>50-fold) emission. This approach complements known methods, and is being extended to biological 1O2 imaging.

Graphical abstract: A mechanistically-distinct approach to fluorescence visualization of singlet oxygen

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