以罗丹明6G酰肼（R6GH）和4-（二乙氨基）水杨醛为试剂,通过席夫碱反应制备了一种新的传感探针R6GHS,并对探针的结构进行了表征分析。紫外-可见吸收和荧光光谱研究发现,该探针对Cu2＋显示出高度的检测选择性,在乙腈-水（3∶7,体积比）Tris-HCl（pH值=7.0）缓冲溶液中,随着Cu2＋的加入,探针螺环打开,可以明显地观察到溶液由无色变为红色,同时伴随鲜有的荧光淬灭现象,并且该响应过程迅速而且可逆,有望用于水质中Cu2＋快速检测。
A novel rhodamine-based sensor probe R6GHS was synthesized from the Schiff base reaction of R6GH with 4-(diethylamino) salicylaldehyde.The structure of R6GHS was confirmed.The UV-Vis absorption and fluorescence spectrum study found R6GHS showed highly selective detection for Cu2+ over a wide range of metal ions in CH3CN-water(3∶7,V/V)Tris-HCl(pH=7.0).Furthermore,upon the addition of Cu2+,the spirolactam ring of R6GHS was opened and the solution color changed from colorless to red.Strangely,an unexpected fluorescence was observed,which is contrary to the fluorescence turn-on of the most rhodamine-based,and the response process was quick and reversible,which is promising for its practical utility in fast detection of Cu2+ in aqueous environment.
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