Ahmadi S, Dabbagh HA, Grieco P, Balalaie S. A cystine-based dual chemosensor for fluorescent-colorimetric detection of CN
- and fluorescent detection of Fe
3+ in aqueous media: Synthesis, spectroscopic, and DFT studies.
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020;
228:117696. [PMID:
31761545 DOI:
10.1016/j.saa.2019.117696]
[Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 10/16/2019] [Accepted: 10/24/2019] [Indexed: 05/25/2023]
Abstract
A new dual-responsive chiral cystine based chemosensor, Cys(cou)2, has been designed and characterized by 1H NMR, 13C NMR, FT-IR, UV-vis as well as elemental analysis. This sensor exhibited an excellent response towards Fe3+ and CN- with high selectivity and sensitivity by fluorescence turn-off mechanism. The binding mode of Cys(cou)2 with Fe3+, and CN- was confirmed by ESI-MS, 1H NMR, and fluorescence titration and also quantum chemical calculation. These results showed that the stoichiometric ratio of Cys(cou)2-Fe3+ and Cys(cou)2-CN is 1:1 and 1:3 in DMSO/Tris aqueous buffer (1:1, v/v), respectively. The linear relationship of the Stern-Volmer plot illustrates the static quenching mechanism at different concentrations. The detection limit (LOD) and binding constant (Ka) for Fe3+ and CN- are 0.029 μM, 1.28 × 104 and 0.51 μM, 9.94 × 106, respectively. Moreover, Cys(cou)2 can act as a colorimetric sensor for CN- in DMSO with the color change from colorless to yellow.
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