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Issue 63, 2017
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Synthesis of poly(p-phenylene) containing a rhodamine 6G derivative for the detection of Fe(III) in organic and aqueous media

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Abstract

A conjugated polymer (CP) of poly(p-phenylene) (PPP) containing rhodamine 6G (R6G) was synthesized by the Suzuki-coupling reaction, in which PPP acted as a blue-emitting energy donor and R6G acted as a ligand for Fe(III) as well as the energy acceptor for Förster resonance energy transfer (FRET). The spirolactam ring in R6G was nonfluorescent and colorless, but became open upon exposure to Fe(III) and readily absorbed the blue emission of the PPP backbone. As the polymer was exposed to Fe(III), the blue emission from PPP decreased and the red emission of the ring-opened R6G increased via FRET. The sensing of the polymer for Fe(III) in ethanolic solution was not successful, because of negligible FRET. In the solid state of the polymer, the distance between the main chain (PPP) and the side chain (R6G) was sufficiently decreased to enable the transfer of fluorescence energy. As a result, the film sensor could detect Fe(III) in an ethanol solution and a paper-based strip sensor could detect Fe(III) in an aqueous solution with a change in the fluorescence color. The cellulosic paper of the strip provided rapid detection and improved the limit of detection. From the changes in the fluorescence of the polymer sensor in the presence of Fe(III), the film and strip sensors could detect Fe(III) in any media. Moreover, the film could be regenerated for repeated use after treatment with ethylenediaminetetraacetic acid (EDTA).

Graphical abstract: Synthesis of poly(p-phenylene) containing a rhodamine 6G derivative for the detection of Fe(iii) in organic and aqueous media

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Publication details

The article was received on 17 Jul 2017, accepted on 09 Aug 2017 and first published on 16 Aug 2017


Article type: Paper
DOI: 10.1039/C7RA07853F
Citation: RSC Adv., 2017,7, 39852-39858
  • Open access: Creative Commons BY license
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    Synthesis of poly(p-phenylene) containing a rhodamine 6G derivative for the detection of Fe(III) in organic and aqueous media

    H. Namgung, J. Kim, Y. Gwon and T. S. Lee, RSC Adv., 2017, 7, 39852
    DOI: 10.1039/C7RA07853F

    This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

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      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
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      [Original citation] - Published by the PCCP Owner Societies.
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      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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      [Original citation] - Published by The Royal Society of Chemistry.

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