NEW SELECTIVE ''ON-OFF'' FLUORESCENCE CHEMOSENSOR BASED ON CARBAZOLE SCHIFF BASE FOR Fe3+ DETECTION

Abstract

A new double Schiff base, carbazole, and diaminomaleonitrile-based chemosensor for Fe3+ with high sensitivity and selectivity was designed and synthesized. Addition of only Fe3+ ions induced the fluorescence quenching of the chemosensor in DMF solution. The chemosensor formed a 1:1 complex with Fe3+ with the high binding constant of 7.98·10–6 M–1. The chemosensor displayed low detection limit (3.75·10–8 M) and fast response time (15 s) to Fe3+.