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The turn-off responses of AIE-S towards Cu2+. The addition of increasing concentrations of Cu2+ (0-20 μM) gradually quenched the fluorescence of AIE-S (20 μM). Spectra were taken in HEPES (10 mM, pH 7.4, 25oC, 10% THF) immediately after the addition of Cu2+ (λex 350 nm). (a) Spectra collected between 490-675 nm. (b) Correlation between the fluorescence intensity at 533 nm of the system (y) and the molar ratio of Cu2+ to AIE-S (x).
