Optical Cu²⁺ probe bearing an 8-hydroxyquinoline subunit: High sensitivity and large fluorescence enhancement

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• 作者：Hao Zhu ; Jiangli Fan ; ^{fanjl@dlut.edu.cn} ; Jing Lu ; Mingming Hu ; Jianfang Cao ; Jing Wang ; Honglin Li ; Xiaojian Liu ; Xiaojun Peng ^{pengxj@dlut.edu.cn}
• 关键词：Optical probe ; Cu2+ ; High sensitivity ; 8-Hydroxyquinoline ; Environmental samples
• 刊名：Talanta
• 出版年：2012
• 期刊代码：106_00399140
• 类别：ch
• 出版时间：15 May, 2012
• 卷：93
• 期：Complete
• 页码：55-61
• 文件大小：1279 K

摘要

A new fluorescent and colorimetric probe rong class="boldFont">RCu1rong> with ultra-sensitivity (detection limit is 4.7 nM (3蟽)) was developed. It is based on a rhodamine B derivative modified with a functionalized 8-hydroxyquinoline group as a copper-binding site which greatly increases the affinity for Cu²⁺. Cu²⁺ acts not only as a selective recognizing guest but also a hydrolytic promoter. rong class="boldFont">RCu1rong> showed single-selectively sensing Cu²⁺ over other cations and much larger fluorescence enhancement (as high as over 1000-fold) than those based on Cu²⁺-complexation. The detection mechanism was proved by TOF-MS, FT-IR, ¹H NMR and Gaussian calculations. Based on the outstanding recognition ability of rong class="boldFont">RCu1rong> toward Cu²⁺, an analytical procedure was developed for Cu²⁺-determination in natural water samples and soil sample.