Pyrene based Schiff base ligand: A highly selective fluorescence chemosensor for the detection of Cu2+ions

A Schiff base ligand L has been designed and synthesized by the condensation of 1 '-Hydroxy-2 '-acetonaph-thonehydrazide with pyrene aldehyde for the detection of Cu2+ ions. The ligand was spectroscopically charac-terized by all possible techniques. Among different metal ions, Cu2+ ions give a tremendous enhancement of fluorescence intensity in 20% water with THF. The "Turn-On" fluorescence for Cu2+ ions utilizes the Photo-induced Electron Transfer (PET) mechanism. It has been observed that the presence of relevant cations and anions did not affect the probe's fluorescence intensity. The stoichiometric binding mode of the complex is confirmed using Job's method. The low detection limit and reversibility make it cost-effective.