Fig. 4. Change of fluorescence intensity at 450 nm as a function of time. (a) Upon mixing 3a or 1a dissolved in DMF with CHCl3. The final concentration of 1a or 3a is 1 μM and, (b) 3a (10 nM and 1 nM), in the mixed solvent of CHCl3 and DMF (1/1, v/v). The measurements were carried out using an excitation wavelength of 281 nm.
