Amino-Quinoline Based Colorimetric Chemosensor for Cu2+ Detection
D. Y. Patil, N. B. Khadke, Amit Patil, Ashok V. Borhade
Abstract
Abstract Benzohydrazide based Schiff base was synthesized by condensation of 2-amino-quinoline-3-carbaldehyde and 4-nitrobenzohydrazide. The colorimetric sensing activity of Schiff base ligand (SBL) toward various metal ions was successfully investigated in CH3CN solution. After addition of Cu2+, a significant change was observed at 428 nm with red shift of 32 nm in visible region while other metal ions did not show any changes. Association constant was calculated using Benesi–Hildebrand method and was observed to be 2.317 × 103 M–1. Detection and quantification limits for SBL−Cu2+ are 9 × 10–5 and 2.9 × 10–4 M, respectively. In competitive experiment with other metal cations, SBL presented higher sensitivity toward Cu2+ in the presence of CH3CN.