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Fig. 1
(A) Representative fluorescence images of 3 showing variable colors in the aqueous solutions of different pH values. (B) Fluorescence emission and (C) absorption spectra of 3 in the solutions of different pH values (6-10). (D) Invertible emission changes of 3 (10 μM) through repeatedly modulating the pH between 6 and 10 under 365 nm UV radiation. (E) The proposed pH sensing mechanism of 3. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
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