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2,6-Bis(2-Benzimidazolyl)Pyridine Fluorescent Red-Shifted Sensor for Recognition of Zinc(II) and a Calorimetric Sensor for Iron Ions

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Abstract

The ability of 2,6-bis(2-benzimidazolyl)pyridine (bbp) as an optical sensor was studied by fluorescence spectroscopy, colorimetric and UV-visible techniques. The fluorescence spectra of bbp demonstrated a red-shifted upon addition of Zn2+ ion, whereas rest of the cations did not induce any shift. Selectivity of the sensor was examined toward Zn2+ in the presence of a wide range of cations, as interfering agents, that showed no disruption in its function. In addition, the pH effect was tested on the fluorescence response of bbp; which showed the efficiency of the sensor in a wide pH range. The limit of detection for Zn2+ was estimated as 2.1 μM. Furthermore, the colorimetric studies were carried out and the observations showed a color change from colorless to purple by the addition of Fe2+ ion and from colorless to yellow by the addition of Fe3+. The UV-visible studies were carried out to confirm the colorimetric observations. The color changes occurred when Fe2+ and Fe3+ were added to the sensors solution, respectively. The detection limits were calculated as 2.8 × 10−7 M and 3.5 × 10−6 M for Fe2+ and Fe3+, respectively. Hence, bbp can be used as a dual mode optical sensor for detection of Zn2+ by fluorescence and discriminately detection of Fe2+ and Fe3+ visually.

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Acknowledgments

The authors thank the research council of University of Tehran for financial support.

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Authors and Affiliations

  1. School of Chemistry, College of Science, University of Tehran, Tehran, Iran

    Bita Vosough Razavi, Alireza Badiei & Negar Lashgari

  2. Nanobiomedicine Center of Excellence, Nanoscience and Nanotechnology Research Center, University of Tehran, Tehran, Iran

    Alireza Badiei

  3. Department of Chemistry, Alzahra University, Tehran, Iran

    Ghodsi Mohammadi Ziarani

  4. National laboratory of pharmaceutical research, Alzahra University, Tehran, Iran

    Ghodsi Mohammadi Ziarani

Authors
  1. Bita Vosough Razavi
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  2. Alireza Badiei
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  3. Negar Lashgari
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  4. Ghodsi Mohammadi Ziarani
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Corresponding author

Correspondence to Alireza Badiei.

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Vosough Razavi, B., Badiei, A., Lashgari, N. et al. 2,6-Bis(2-Benzimidazolyl)Pyridine Fluorescent Red-Shifted Sensor for Recognition of Zinc(II) and a Calorimetric Sensor for Iron Ions. J Fluoresc 26, 1723–1728 (2016). https://doi.org/10.1007/s10895-016-1863-7

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  • DOI: https://doi.org/10.1007/s10895-016-1863-7

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