A naphthol-based fluorescence turn-on sensor for detecting Ga(lll)and its application to test strips

摘要

A new naphthol-based chemosensor NPN((E)-2-(((2-hydroxynaphthalen-1-ylmethylene)amino)isoindoline-1,3-dione)was synthesized.NPN could sense Ga~(3+)by a fluorescence"turn-on"method from colorless to blue.Detection limit for Ga~(3+)by NPN was determined to be 0.26 μM.The sensing mode of NPN and Ga~(3+)turned out to be a 1:1.NPN could also be successfully applied to visible fluorescent test strips.The sensing process of Ga~(3+)by NPN was illustrated through ~1H NMR titration,Job plot,ESI-MS,and DFT calculations.