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Catalyst + Chemodosimeter → Chemosensor: Incorporation of a catalytic functionality in an indicator displacement assay to realize reversible chemosensing detection

Abstract

A new bimetallic complex, (CN)3FeII(tppz)CuIICl (tppz = 2,3,5,6-tetra(2'-pyridyl)pyrazine) including a Fe(II)-diimine indicator and a dual functional Cu(II) receptor/catalyst, was synthesized to demonstrate the concept of indicator/catalyst displacement assay for the simultaneous detection and detoxification of cyanide. The catalytic degradation property in the assay was necessary for making the detecting system reversible, which the traditional indicator displacement assays could never achieve. After the realization of this new property, the silica-gel-based solid-supporting complex 1 was fabricated for application in a device, which was demonstrated for its use in the naked-eye detection and degradation of cyanide in tap, river, and underground water samples in a repeatable and real-time manner, even in the presence of interfering anions (CH3COO-, N3-, HCO3-, Cl-, NO3-, HPO42-, SO42-, SCN-, and OCN-). Within 300 min, cyanide was quantitatively oxidized into the less toxic cyanate by 1 in the presence of H2O2. The detection limit of 1 for cyanide was found to be 1.16 × 10-4 M (3.02 mg/L).

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Supplementary files

Article information


Submitted
18 Nov 2019
Accepted
07 Feb 2020
First published
07 Feb 2020

J. Mater. Chem. C, 2020, Accepted Manuscript
Article type
Paper

Catalyst + Chemodosimeter → Chemosensor: Incorporation of a catalytic functionality in an indicator displacement assay to realize reversible chemosensing detection

C. Shen, Q. Tang, C. Gong and C. F. Chow, J. Mater. Chem. C, 2020, Accepted Manuscript , DOI: 10.1039/C9TC06308K

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