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A: Normalized UV-vis absorbance of 1-4 in 25 mM HCl MeOH-H2O (1:1). B: Normalized fluorescence (Ex = 650 nm) of 1-4 in 25 mM HCl MeOH-H2O (1:1). C: Fluorescence response of 1-4 (1 μM) in MeOH-Na2HPO4/citric acid buffer (1:1) at different pHs.
