Fig. 4.
Fluorescence spectra of 10 µM of (a) compound 1, (b) compound 2, and (c) compound 3 in the presence of different kinds of proteins (10 µM), respectively. (d) Fluorescence response (F/F0) of compound 1 (black bar), 2 (red bar), and 3 (blue bar) in the presence of 10 µM protein, respectively. F: The fluorescence intensity of dye in the presence of proteins. F0: The fluorescence intensity of dye (for interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article).
