Colorimetric and fluorescence sensing of Cu²⁺ in water using 1,8-dihydroxyanthraquinone-尾-cyclodextrin complex with the assistance of ammonia

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• 作者：Yu Wang^a ; ^{wangyu1168@sxu.edu.cn} ; Lei Wang^a ; Li Li Shi^a ; Zhuo Bin Shang^a ; Zhao Zhang^a ; Wei Jun Jin^b ; ^{wjjin@bnu.edu.cn}
• 关键词：1 ; 8-Dihydroxyanthraquinone ; 尾-cyclodextrin ; Cu2+ ; Colorimetric ; Fluorescence quenching ; Water
• 刊名：Talanta
• 出版年：2012
• 期刊代码：106_00399140
• 类别：ch
• 出版时间：30 May, 2012
• 卷：94
• 期：Complete
• 页码：172-177
• 文件大小：960 K

摘要

1,8-Dihydroxyanthraquinone (DHAQ) can form an inclusion complex with 尾-cyclodextrin(尾-CD) in aqueous media, which can be employed to solubilize and stabilize the DHAQ in water. With the assistance of ammonia, the supramolecular DHAQ-尾-CD complex showed a selective chromogenic behavior toward Cu²⁺ ions by changing the color of the solution from citrus red to purple red, which could be easily observed with the naked eye. Moreover, fluorescence emission of the system was selectively quenched by Cu²⁺ ions. The fluorescence response was concentration-dependent and can be well described by the typical Stern-Volmer model. An easily applied method for Cu²⁺ determination in an aqueous medium was thus established. Under the optimum conditions, the method exhibits a dynamic response range for Cu²⁺ from 8.0 脳 10^鈭? to 2.0 脳 10^鈭? M, with a detection limit of 2.7 脳 10^鈭? mol L^鈭?.