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 8

Plot of pH versus log [(A_max − A)/(A − A_min)] for coumarin 3 in a 10% aqueous ethanolic-universal buffer solution, which is most pronounced at a pH of 6. Absorbance at 402 nm was monitored.