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 7

Curve demonstrating the fluorescence intensity of coumarin 3 as a function of pH. Measured with coumarin 3 (1 × 10⁻⁵ M) dissolved in a 10% ethanolic-universal buffer solution (λ_ex = 500 nm, λ_em = 650 nm).