Sharma V, Dutta S, Sahu D, Pandey A, Kumar D, Das S, Patra GK. A new quinoline-based fluorescent-colorimetric chemosensor for sensitive and selective "on-off" detection of Pb
2+ ions.
RSC Adv 2025;
15:4236-4249. [PMID:
39931405 PMCID:
PMC11809492 DOI:
10.1039/d4ra08193e]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2024] [Accepted: 01/21/2025] [Indexed: 02/13/2025] Open
Abstract
For the first time, a novel mono Schiff base of a quinoline-based reversible fluorescent-colorimetric receptor (L) has been designed for the detection of Pb2+ ions in a semi-aqueous medium. The receptor L exhibited a very good selective fluorescent-colorimetric quick on-off response when exposed to Pb2+. The colorimetric assay showed a sensitivity of 1.2 × 10-6 M, while the fluorescent assay exhibited a sensitivity of 9.9 × 10-7 M for Pb2+. A 1 : 1 stoichiometric complexation between L and Pb2+ was determined using ESI-MS spectra and Job's plot measurements. Pb2+ was successfully measured using receptor L in both real samples and in an aqueous solution of the protein bovine serum albumin, as well as in the construction of an INHIBIT-type molecular logic gate.
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