Journal
JOURNAL OF LUMINESCENCE
Volume 132, Issue 8, Pages 1987-1993Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2012.03.039
Keywords
Acidic media; Chemosensor; Copper(II); Fluorescence quenching; Rhodamine derivative
Categories
Funding
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province [AE201029]
- Qing Lan Project
- Jiangsu Province
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A new rhodamine derivative (RhB-Im) was synthesized as an on-off chemosensor for Cu2+ in an acidic aqueous solution. RhB-Im exhibited chemically reversible and highly selective and sensitive fluorescence response toward Cu2+ in aqueous acetate-buffer/DMF solution (pH 3.6) over other competitive metal ions. Upon addition of Cu2+, RhB-Im displayed remarkable fluorescence quenching accompanied by a clear color change from pink to red. Based on the analysis of Stern-Volmer plots, a static quenching mode was proposed to be primarily responsible for the fluorescence quenching event when the concentration of Cu2+ was low, but, the energy- and electron-transfer processes cannot be ruled out. (c) 2012 Elsevier B.V. All rights reserved.
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