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Di-(2-picolyl)amine functionalized tetraphenylethylene as multifunctional chemosensor.

Zuzhe Kang1, Zhong Zhang1, Yue Zhang1

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A new multifunctional chemosensor, T-D, enables sensitive detection of Cu2+, phosphate, and glyphosate. This sensor utilizes a fluorescent switch platform for rapid and selective analysis in aqueous solutions and biological systems.

Keywords:
ChemosensorCupric ionGlyphosatePhosphateTetraphenylethylene

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Environmental Science

Background:

  • Developing sensitive and selective chemosensors is crucial for detecting various analytes in environmental and biological samples.
  • Existing methods for detecting phosphate and glyphosate can be complex or lack sensitivity.
  • Multifunctional sensors offer a promising approach for simultaneous or sequential detection of multiple targets.

Purpose of the Study:

  • To develop a novel multifunctional chemosensor (T-D) for the sensitive, selective, and rapid detection of Cu2+, phosphate (PO43-), and glyphosate.
  • To establish an "on-off-on" fluorescent switch platform based on a Cu2+-indicator displacement strategy.
  • To demonstrate the practical applicability of the chemosensor in real samples and biological systems.

Main Methods:

  • Synthesis of the multifunctional chemosensor T-D, incorporating tetraphenylethylene and di-(2-picolyl)amine (DPA).
  • Utilizing a Cu2+-indicator displacement strategy to create a "on-off-on" fluorescent response.
  • Employing fluorescence spectroscopy to monitor the detection of analytes based on changes in emission intensity and aggregation-induced emission (AIE).
  • Testing the sensor's performance in spiked real samples, including aqueous solutions, living cells, and zebrafish.

Main Results:

  • The chemosensor T-D demonstrated sensitive and selective detection of Cu2+, PO43-, and glyphosate in aqueous solutions.
  • An "on-off-on" fluorescent switching mechanism was successfully implemented, with detection limits of 19 nM for PO43- and 25 nM for glyphosate.
  • The sensor showed practical applicability through detection in spiked real samples and visual semi-quantitative determination in living cells and zebrafish.
  • Test strips were developed for simplified glyphosate detection.

Conclusions:

  • The developed T-D chemosensor is a powerful tool for detecting phosphate anions and glyphosate in aqueous and biological environments.
  • The sensor's design provides a new template for creating other multifunctional chemosensors.
  • The study highlights the potential of the T-D chemosensor for environmental monitoring and biological imaging applications.