Amino-Quinoline Based Colorimetric Chemosensor for Cu.sup.2+ Detection

• Published in: Journal of analytical chemistry (New York, N.Y.) Vol. 77; no. 1; pp. 18 - 25
• Main Authors: Patil, D. Y, Khadke, N. B, Patil, A. A, Borhade, A. V
• Format: Journal Article
• Language: English
• Published: Springer 01-01-2022
• Subjects: Ethylenediaminetetraacetic acid; Quinoline; Schiff bases
• ISSN: 1061-9348; 1608-3199
• DOI: 10.1134/S1061934822010105

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 CH.sub.3CN solution. After addition of Cu.sup.2+, 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 x 10.sup.3 M.sup.-1. Detection and quantification limits for SBL-Cu.sup.2+ are 9 x 10.sup.-5 and 2.9 x 10.sup.-4 M, respectively. In competitive experiment with other metal cations, SBL presented higher sensitivity toward Cu.sup.2+ in the presence of CH.sub.3CN.