一种罗丹明衍生物在不同介质中识别Cu^(2+)的性能  

Sensing Performance of a Rhodamine Derivative for Cu^(2+) in Different Media

作　　者：代坤[1] 徐保莲 陈景文[2] 

机构地区：[1]常州大学石油化工学院,江苏常州213164 [2]盐城工学院化学与生物工程学院,江苏盐城224051

出　　处：《精细化工》2014年第8期955-959,978,共6页Fine Chemicals

基　　金：江苏省自然科学基金(BK2012674);江苏省新型环保重点实验室开放基金(AE201029)~~

摘　　要：采用电子吸收和荧光光谱研究了罗丹明B-5-硝基水杨醛(RhB-NSal)在无水乙腈和醋酸缓冲溶液中对Cu2+离子的识别性能。在两种介质中,RhB-NSal对Cu2+均具有很高的识别性能,仅Fe3+和Bi3+产生一定程度的干扰。RhB-NSal与Cu2+可逆性结合,形成摩尔比为1∶1的配合物,结合常数分别为6.72×104和4.23×104L/mol,对Cu2+的检测限分别为0.49和14.98μmol/L。在含水介质中,RhB-NSal识别Cu2+的灵敏度比在无水乙腈中稍低,但吸收光谱响应依然显著。硝基有助于提高RhB-NSal识别Cu2+的灵敏度,RhB-NSal有望成为Cu2+的荧光增强及可视型识别试剂。The sensing behaviors of a rhodamine derivative RhB-NSal bearing a -NO2 group for Cu2＋ in dry acetonitrile and aqueous acetate buffer media were investigated. In each medium, significant absorption and fluorescence enhancements accompanied by an instant color change were observed for RhB-NSal upon addition of Cu2＋. RhB-NSal reversibly bound with Cu2＋ to form a 1：1 stoichiometric complex with an association constant of 6. 72 × 10^4 and 4. 23 × 10^4 L/mol, respectively. RhB-NSal displayed a high selectivity for Cu2＋ over other ions except that Fe3＋ and Bi3＋ ions induced a little interference. In dry acetonitrile, Cu2＋ resulted in remarkable spectroscopic enhancements of RhB-NSal with a detection limit of 0. 49μmol/L for Cu2＋ , exhibiting higher sensitivity than that of an analogue bearing no substituent on its phenol ring. In aqueous solution, RhB-NSal likewise displayed a higher selectivity but a lower sensitivity for Cu2＋ than that in acetonitrile, with a detection limit of 14. 98 μmol/L, still more sensitive than RhB-Sal in absorption. By virtue of these properties, RhB-NSal could be used as a promising candidate for an ＂Off-On＂ fluorescent and colorimetric chemosensor for Cu2 ＋ in different media.

关 键 词：罗丹明B-5-硝基水杨醛 荧光识别 铜离子(Ⅱ) 取代基效应 功能材料 

分 类 号：O657.31[理学—分析化学]