Fabrication of a Hydrazone-Based Al(III)-Selective “Turn-On” Fluorescent Chemosensor and Ensuing Potential Recognition of Picric Acid

A hydrazone-based N′1,N′3-bis­((E)-4-(diethylamino)-2 –hydroxybenzylidene)­isophthalohydrazide (NDHIPH), has been synthesized, characterized, and assessed for its highly selective and sensitive (limit of detection, 2.53 nM) response toward Al­(III) via fluorescence enhancement in 95% aqueous medium. All experimental results of analytical studies are in good consonance with the theoretical studies performed. Further, this NDHIPH-Al­(III) ensemble is used for selective and sensitive (12.15 nM) detection of explosive picric acid (PA) via fluorescence quenching. This reversible behavior of NDHIPH toward Al­(III) and PA is used for the creation of a molecular logic gate.