4.7 Article

Nanomolar determination of nitrofurans in water via excited-state inter-ligand proton transfer

Journal

ANALYTICA CHIMICA ACTA
Volume 1181, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.aca.2021.338905

Keywords

Luminescent detection; High sensitivity; Aqueous nitrofuran antibiotics; Luminescent lanthanide complex; Excited-state inter-ligand proton transfer

Funding

  1. National Natural Science Foundation of China [22075071]
  2. Students' Innovation and Entrepreneurship Training Project of China [202010212003]
  3. Reform and Development Fund Project of Local University by the Central Government

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The development of highly efficient sensing systems for trace organic contaminants requires the understanding and application of excited-state inter-ligand proton transfer (ESILPT) processes. Utilizing strategically synthesized lanthanide complexes with excellent photophysical properties, a feasible pathway to construct efficient chemo-sensors for ultra-sensitive detection of nitrofuran antibiotics has been demonstrated. This advancement is expected to broaden and deepen research in complex-based luminophores, potentially useful in trace detection and biological imaging.
Qualification and quantification of trace organic contaminants necessitates development of highly effi-cient sensing system, where excited-state inter-ligand proton transfer (ESILPT) provides a feasible pathway to construct efficient chemo-sensors. Herein, a strategically synthesized lanthanide complex, Eu(DBM)(3)(MeOH)(3) (briefly as Eu-DBM-MeOH; DBM = dibenzoylmethane), features two-step ESILPT processes, along with modification on molecular structure and energy band. As a result, Eu-DBM-MeOH exhibits excellent photophysical properties with characteristic luminescence of Eu3+ ion. Benefiting from these merits, the Eu-DBM-MeOH complex acts as ultra-sensitive chemo-sensor toward nanomolar-level nitrofuran antibiotics (nitrofurazone and nitrofurantoin) in water, by disrupting ESILPT processes. Combining the advantages on photophysical property and luminescent sensitivity, ESILPT-active com-pounds are expected to widen and deepen the research on complex-based luminophores, being potentially useful in trace detection and biological imaging. (c) 2021 Elsevier B.V. All rights reserved.

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