Synthesis, Characterization, Analytical Application, and Theoretical Studies of a Schiff Base, (E)-2-(2-aminophenylthio)-N-(thiophen-2-yl-methylene) benzenamine

In this study, a new Schiff base, ( E )-2-(2-aminophenylthio)- N -(thiophen-2-yl-methylene) benzenamine was synthesized for selective detection of Hg 2+ . This Schiff base was characterized by proton nuclear magnetic resonance ( 1 HNMR) spectroscopy, carbon-13 nuclear magnetic resonance ( 13 CNMR) spectroscopy, and Fourier-transform infrared (FTIR) spectroscopy. Binding interaction between ( E )-2-(2-aminophenylthio)- N -(thiophen-2-yl-methylene)benzenamine and various metal ions has been studied by UV–Vis spectroscopic measurements and shows promising coordination towards Hg 2+ and almost no interference from other metal ions ( Ag + , Mn 2+ , Fe 3+ , Al 3+ , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ , Cd 2+ , Fe 2+ and Cr 3+ ).This Schiff base exhibiting detection limit of 3.8 × 10 − 8 M. The Schiff base newly synthesized in this study was successfully applied to the determination of Hg 2+ in water samples. In addition to the experimental study, a theoretical study was conducted using Gaussian 09 program to support the experimental findings. FTIR, NMR, bond angle, bond length, torsional angles and structural approximation were studied using theoretical consideration.