Synthesis and Spectral Characterisation of (E)-3-(3-(4 (Dimethylamino)Phenyl)Acrylo-yl)-4-Hydroxy-2H-Chromen-2-One and Their Antibacterial Activity and Acetylcholinesterase Inhibition

Figure 16

Emission spectra (λ_ex = 500 nm) of coumarin 3 (1 × 10⁻⁵ M) in the presence of different concentrations of DNA in a 0.1 M Tris-HCl buffer. The DNA concentrations used to obtain the different fluorescence intensities at 575 nm are 0.400 (dark blue), 0.550 (black), 0.700 (red), 0.900 (green), and 1.100 μg/mL (light blue).