Skip to main content

A rhodamine–bistriazole based fluorescent and colorimetric sensor containing a phenyl linker for Fe(III) detection


A rhodamine-based fluorescent sensor bearing 1,2-phenylenediamine linked to a bistriazole moiety was designed and synthesized through the copper(I)-catalyzed click chemistry. The bistriazole-based sensor containing an aromatic linker was highly selective toward Fe3+, among other metal ions in MeCN/H2O (1:9 v/v, pH 7.0). Upon the addition of Fe3+, the solution of the sensor changed from colorless to pink and fluorescence emission increased 614-fold, visually observed within 5 min. For the titration experiments, the absorption and fluorescence intensity were distinctly enhanced with the increasing concentrations of Fe3+ and the limit of detection (LOD) was calculated to be 0.15 μM. The binding ratio of the sensor–Fe3+ complex was a 1:1 ratio, confirmed by the Job’s plot. Besides, the optimized condition of the sensor for Fe3+ recognition was investigated in a pH range of 5.0–7.0.

This is a preview of subscription content, access via your institution.

Scheme 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7


Download references


This work was supported by the Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi. We would like to thank the central instrumentation laboratory of Rajamangala University of Technology Thanyaburi for NMR facility.

Author information

Authors and Affiliations


Corresponding author

Correspondence to Kanokorn Wechakorn.

Ethics declarations

Conflict of interest

There are no conflicts of interest to declare.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Electronic supplementary material

Below is the link to the electronic supplementary material.

Supplementary file1 (DOCX 5326 kb)

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Wechakorn, K., Chomngam, S., Eiamprasert, U. et al. A rhodamine–bistriazole based fluorescent and colorimetric sensor containing a phenyl linker for Fe(III) detection. Chem. Pap. 75, 883–892 (2021).

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI:


  • Fluorescent sensor
  • Rhodamine
  • Bistriazole
  • Click chemistry
  • Fe3+