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A reversible fluorescent chemosensor for Fe3+ and H2PO4 − with “on-off-on” switching in aqueous media

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Abstract

To realize highly selective relay recognition of Fe3+ and H2PO4 − ions, a simple benzimidazole-based fluorescent chemosensor (L) was designed and synthesized. Sensor L displays rapid, highly selective, and sensitive recognition to Fe3+ in H2O/DMSO (1:1, v/v) solutions. The in situ-generated L-Fe3+ complex solution exhibits a fast response and high selectivity toward dihydrogen phosphate anion via the Fe3+ displacement approach. The detection limits of sensor L to Fe3+ and L-Fe3+complex to H2PO4 − anion were estimated to be 1.0 × 10−9 mol/L. Notably, the sensor was retrievable to indicate dihydrogen phosphate anions with Fe3+, and H2PO4 −, in turn, increased. This successive recognition feature of sensor L makes it a potential utility for Fe3+ and H2PO4 − anion detection in aqueous media.

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Authors and Affiliations

  1. Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China; Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Gansu, 730070, China

    Jun Liu, Qi Lin, YouMing Zhang & TaiBao Wei

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  1. Jun Liu
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  2. Qi Lin
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  3. YouMing Zhang
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  4. TaiBao Wei
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Correspondence to TaiBao Wei.

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Liu, J., Lin, Q., Zhang, Y. et al. A reversible fluorescent chemosensor for Fe3+ and H2PO4 − with “on-off-on” switching in aqueous media. Sci. China Chem. 57, 1257–1263 (2014). https://doi.org/10.1007/s11426-014-5108-9

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  • DOI: https://doi.org/10.1007/s11426-014-5108-9

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