Issue 33, 2020

A ratiometric optical strategy for bromide and iodide ion sensing based on target-induced competitive coordination of a metal–organic nanosystem

Abstract

A ratiometric sensor through the built-in correction gains stronger anti-interference ability and more accurate analysis results compared with a single-signal sensor. Herein, a novel ratiometric assay platform coupled with fluorescence (FL) and scattering has been constructed for the selective and accurate quantization of Br/I. The ratiometric sensor is based on a metal–organic nanosystem, which is constructed via coordination bonding-induced self-assembly between non-conjugated polymer nanoparticles (NC-PNPs) and Hg(II), consequently displaying fluorescence and strong second-order scattering (SOS) signals. In the response system, the NC-PNPs function as a signal unit, and the Hg(II) ion serves as a recognition element. Upon the introduction of Br/I, the high affinity with Hg(II) makes Br/I snatch Hg(II) from the NC-PNP–Hg(II) nanosystem, causing the nanocomplex to disassemble. The target-triggered disaggregation results in a decrease in the SOS intensity, and meanwhile the Hg–Br or Hg–I compounds produced in situ reduce the FL intensity of the NC-PNPs via static quenching, suggesting the feasibility of ratiometric Br/I detection. Finally, the FL–SOS dual-signal strategy towards Br/I is successfully applied to real water/food samples. The ratiometric analytical platform coupled with FL and SOS offers a new perspective for applications based on target-induced aggregation and disaggregation behavior.

Graphical abstract: A ratiometric optical strategy for bromide and iodide ion sensing based on target-induced competitive coordination of a metal–organic nanosystem

Supplementary files

Article information

Article type
Paper
Submitted
23 Apr 2020
Accepted
06 Jul 2020
First published
07 Jul 2020

J. Mater. Chem. C, 2020,8, 11517-11524

A ratiometric optical strategy for bromide and iodide ion sensing based on target-induced competitive coordination of a metal–organic nanosystem

Y. Z. Fan, L. Han, S. G. Liu, Y. Zhang, H. Q. Luo and N. B. Li, J. Mater. Chem. C, 2020, 8, 11517 DOI: 10.1039/D0TC01983F

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