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Fluorescence Turn on Sensor for Sulfate Ion in Aqueous Medium Using Tripodal-Cu2+ Ensemble

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Abstract

We report the selective recognition of sulfate anion in aqueous medium at biological pH 7.2 over the other interfering anions based on naphthoic acid bearing tripodal ligand by applying fluorescence turn off-on mechanism. The carboxylic acid groups in the ligand enhance the solubility in water and enable it to form complex with copper salt. Thus formed L-Cu2+ ensemble quench the fluorescence of the parent ligand and in turn recognize sulfate anion via revival of fluorescence intensity. The 1:2 stoichiometry was confirmed by ESI mass spectral data and Job’s plot. The average binding constant was found to be 6.2 × 108 M−2.

Tripodal receptor based on naphthoic acid forms complex with copper in water. This L-Cu2+ ensemble selectively recognize sulfate anion in aqueous medium at pH 7.2 over the other anions by fluorescence turn off-on mechanism

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Acknowledgments

G. D. gratefully acknowledges Council of Scientific and Industrial Research (01/2727/13/EMR-II) and Department of Science and Technology (DST), New Delhi, India, for financial support. NH and AB acknowledge Indian Institute of Technology Guwahati, India, for fellowship.

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Authors and Affiliations

  1. Department of Chemistry, Indian Institute of Technology Guwahati, Assam, 781 039, India

    Md. Najbul Hoque, Arghya Basu & Gopal Das

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  1. Md. Najbul Hoque
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  2. Arghya Basu
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  3. Gopal Das
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Correspondence to Gopal Das.

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Hoque, M.N., Basu, A. & Das, G. Fluorescence Turn on Sensor for Sulfate Ion in Aqueous Medium Using Tripodal-Cu2+ Ensemble. J Fluoresc 24, 411–416 (2014). https://doi.org/10.1007/s10895-013-1306-7

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  • DOI: https://doi.org/10.1007/s10895-013-1306-7

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