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Illustration for the synthesis of the dual‐emitting probe 189 and the mechanism for fluorescence turn‐on and ratiometric detection of diethylphosphorothioate (DEP). (The bottom panel shows the fluorescent spectral changes of the dual‐emitting probe upon exposure to DEP and the corresponding fluorescence photographs of the probe solution taken under UV illumination). Reprinted with permission from Ref. 265. Copyright (2014) American Chemical Society.
