Fig. 1. The change in fluorescence emission spectra of (a) 1, (b) 2, and (c) CMP1 with various pH in buffer solution. (d) Plots of normalized intensity ratio Ibasic/Iisoversus pH. The Ibasic was measured at 529, 587 and 604 nm for 1, 2, and CMP1, respectively. The excitation wavelengths for 1, 2, and CMP1 were 375, 400 and 425 nm, respectively.
