Abstract
A hydroxythiophene-bearing benzothiazole (HB) in phosphate buffer solution showed strong yellow fluorescence emission, which selectively and sensitively decreased by addition of IO4−. The reaction between HB and IO4− dramatically accelerated by UV irradiation. The fluorescence emission of HB was gradually recovered upon thermal heating of the IO4−-adducted product, indicating IO4− release. Using these properties, the solution containing HB and IO4− has been used as a fluorescence-based security ink.
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