A highly selective colorimetric and fluorescent chemosensor for Cr2+ in aqueous solutions |
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| Authors: | J Rull-Barrull M d&#x;Halluin E Le Grognec F-X Felpin |
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| Institution: | 1. Université de Nantes, UFR Sciences et Techniques, UMR CNRS 6230, CEISAM, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France;2. Institut Universitaire de France, 1 rue Descartes, 75231 Paris Cedex 05, France |
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| Abstract: | A new rhodamine-based chemosensor was synthetized through a modified copper-catalyzed 3+2]-cycloaddition of an azidocoumarin with an alkynyl-rhodamine. Its sensing properties toward various metal cations in aqueous solutions were investigated by colorimetric changes, UV–vis and fluorescence spectroscopies. The sensor exhibited a high selectivity for Cr2+ over Cr3+ and other divalent cations such as Cu2+, Mg2+, Zn2+, Ca2+, Cd2+, Co2+, Hg2+ and Ni2+. The linear range of detection by fluorescence spectroscopy is 0.07–3.5 mM, with a detection limit of ca. 64 μM. The binding mode of Cr2+ with the sensor was rationalized through experimental evidences. |
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| Keywords: | Chemosensor Chromium Fluorescent Colorimetric Click reaction |
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