Abstract
Two new rhodamine derivatives (L 1 and L 2 ) were synthesized, characterized and their ion recognition property has been investigated. Both of the ionophores exhibit colorimetric and fluorogenic response for Hg2+ and Cr3+ ions among large number of alkali, alkaline earth and transition metal ions tested in acetonitrile. Detail studies on determination of binding constant, binding mode, reversibility of binding, lower detection limit have been carried out. Detection of metal ions in aqueous media has also been demonstrated by preparation of simple, convenient and disposable test paper sensors with two approaches viz. filter paper and membrane filter loaded with these ionophores. Both of these methods responded sharply to both the metal ions (Hg2+ and Cr3+) in aqueous solution, detectable by bared-eye. For better sensing at low concentration of metal ions, reprecipitation followed by filtration enrichment of ligands on membrane filter was employed.
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Acknowledgments
CSIR-CSMCRI Communication no. 165/2014. This work is carried out under CSIR network project CSC 0134. We are grateful to CSIR, New Delhi, for generous support towards infrastructures and core competency development. We thank V. P. Boricha and V. Vakani for recording NMR and IR, respectively.
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Patidar, R., Rebary, B. & Paul, P. Colorimetric and Fluorogenic Recognition of Hg2+ and Cr3+ in Acetonitrile and their Test Paper Recognition in Aqueous Media with the Aid of Rhodamine Based Sensors. J Fluoresc 25, 387–395 (2015). https://doi.org/10.1007/s10895-015-1524-2
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DOI: https://doi.org/10.1007/s10895-015-1524-2