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Optical sensing behavior of 1 towards Cys and GSH. a) Time-dependent fluorescence spectral changes of 1 with Cys. b) Time course of fluorescence intensity of 1 in the presence of Cys. c) Time-dependent fluorescence spectral changes of 1 with GSH. d) Time course of fluorescence intensity of 1 in the presence of GSH. All solutions are composed of 8 μM 1 with 10 equiv of analyte in DMF/phosphate buffer (3:7 v/v, 20 mM, pH 7.4) at 37 °C and λex = 305 nm.
