Fig 6.
The fluorescence turn-on responses of AIE-S-Cu towards Na2S. (a) Fluorescence spectra of AIE-S-Cu in the presence of various concentrations of Na2S. Spectra were taken in HEPES buffer (10 mM, pH 7.4, 25oC, 10% THF) instantly after the addition of Na2S (0-25 μM). The concentrations of AIE-S and Cu2+ were 20 and 10 μM, respectively (λex 350 nm). (b) Plot of fluorescence intensity at 533 nm vs concentrations of Na2S. (c) Regression equation between the logarithm of the fluorescence intensity (mean ± SD, n = 3) growth ratio at 533 nm (y) and the corresponding concentration of Na2S (x). I0 was the fluorescence intensity of the quenched AIE-S-Cu.