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(A) Fluorescence spectra of probe 23 with NaHS in phosphate buffer; (B) fluorescence spectra of probe 23 with NaHS in phosphate buffer; (C) color change of the chemosensor 23 solution; (D) ratio values of fluorescence intensity of probe 23 with NaHS. Reprinted with permission from Ref. [68]. Copyright ©2019 Royal Society of Chemistry.
