A ratiometric optical strategy for bromide and iodide ion sensing based on target-induced competitive coordination of a metal–organic nanosystem. Issue 33 (21st July 2020)

• Record Type: Journal Article
• Authors: Fan, Yu Zhu; Han, Lei; Liu, Shi Gang; Zhang, Ying; Luo, Hong Qun; Li, Nian Bing
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 33(2020)
• Page Start: 11517
• Page End: 11524
• Publication Date: 2020-07-21
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0tc01983f
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A metal–organic nanosystem constructed via coordination bonding-induced self-assembly is used for fluorescence and scattering ratiometric sensing of bromide and iodide ions. 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.