Fluorescence quenching of a rhodamine derivative: Selectively sensing Cu²⁺ in acidic aqueous media

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• 作者：Jihua Ding^a ; Lidi Yuan^b ; Ling Gao^c ; Jingwen Chen^d ; ^{jwchen@ycit.edu.cn}
• 关键词：Acidic media ; Chemosensor ; Copper(II) ; Fluorescence quenching ; Rhodamine derivative
• 刊名：Journal of Luminescence
• 出版年：2012
• 期刊代码：54_00222313
• 类别：ch
• 出版时间：August, 2012
• 卷：132
• 期：8
• 页码：1987-1993
• 文件大小：704 K

摘要

A new rhodamine derivative (RhB-Im) was synthesized as an 鈥渙n-off鈥?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.