An effective mutli-wavelength emissive aluminum ion fluorescence chemosensor based on 3-[1′-(2′-hydroxy-α-methylbenzylidene-imino)]-2-(p-N,N-dimethylaminophenyl)-1,2-dihydroquinazolin-4-(3H)-one

In the paper, a novel mutli-wavelength emissive aluminium ion chemosensor based on 3-[1′-(2′-hydroxy-α-methylbenzylidene-imino)]-2-(p-N,N-dimethyl aminophenyl)-1,2-dihydroquinazolin-4-(3H)-one is designed and synthesized. According to the fluorescence behavior toward several metal ions, it shows high selectivity to Al3+ over other commonly coexistent metal ions (Na+, Mg2+, Co2+, Ni2+, Cu2+, Fe3+, Cr3+, Hg2+, Zn2+, Cd2+) in aqueous environment (pH 7.40). Meanwhile the binding constant between Al3+ and chemosensor achieves 3.92 × 106 M−1 in aqueous media. Moreover, according to the Job plot, 1:1 stoichiometry between Al3+ and the sensor was deduced in aqueous media (pH 7.4). The good selectivity and sensitivity in aqueous media effectively enhance the application value of the chemosensor for Al3+.

Graphical abstractA novel mutli-wavelength emissive aluminum ions chemosensor in aqueous media is designed and synthesized. The binding constant between Al3+ and chemosensor achieves 3.92 × 106 M−1 in aqueous media.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A fluorescent chemosensor based on a new heterocyclic compound was synthesized. ► The fluorescent sensor exhibited high selectivity and sensitivity for Al3+ in aqueous media (pH 7.40). ► A high binding constant (3.92 × 106 M−1) between sensor and Al3+ was obtained.