Schiff Base Ligand 3-(-(2-Hydroxyphenylimino) Methyl)-4H-Chromen-4-One as Colorimetric Sensor for Detection of Cu²⁺, Fe³⁺, and V⁵⁺ in Aqueous Solutions

Figure 4

(a) UV–visible absorption spectra of SL upon the addition of different equiv. of Cu²⁺ ions with absorbance intensity of SL as a function of Cu²⁺ concentration at 470 nm (inset), and (b) Benesi–Hildebrand plot of [SL]/Abs against 1/[Cu²⁺].

(a)

(b)