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

Kanokorn Wechakorn, Sinchai Chomngam, Utt Eiamprasert, and Palangpon Kongsaeree

Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathum Thani, Thailand



Received: 27 May 2020  Accepted: 9 September 2020


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.

Keywords: Fluorescent sensor; Rhodamine; Bistriazole; Click chemistry; Fe3+

Full paper is available at

DOI: 10.1007/s11696-020-01349-1


Chemical Papers 75 (3) 883–892 (2021)

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