基于不对称双Schiff碱异三核配合物为中性载体的水杨酸根离子选择性电极的研究  

Studies on salicylate- selective electrode based on dissymmetrical double schiff base complex as neutral ionophore

作　　者：凌贵知[1,2] 袁若[1] 柴雅琴[1] 周伟[1] 吴峡[1] 

机构地区：[1]西南大学化学化工学院,重庆市现代分析重点实验室,重庆400715 [2]成都中医药大学峨眉学院,四川峨眉山614201

出　　处：《化学传感器》2009年第1期21-24,共4页Chemical Sensors

基　　金：国家自然科学基金(20675064);西南大学高科技项目基金(XSGX02);重庆市自然科学基金(CSTC-2005BB4100)资助

摘　　要：研制了以不对称双Schiff碱异三核配合物为中性载体的PVC膜电极,对Sal-具有近Nernst电位响应,并呈现出反Hofmeister选择性行为。在pH5.0的磷酸盐缓冲体系中其线性响应范围为8.9×10-6～1.0×10-1mol/L,斜率为55.7mV/dec,检测下限为6.1×10-6mol/L。采用交流阻抗技术研究了阴离子与载体的作用机理,结果表明配合物中心金属原子的结构以及载体本身的结构与电极响应行为之间有密切的构效关系。将电极用于药品分析,结果令人满意。A new selective salicylate PVC membrane electrode based on dissymmetrical double Schiff base heterotrinuclear complex as the neutral carrier is made. This type of electrode displays an anti-Hofmeister selectivity sequence with a preferential response to salicylate. The electrode exhibits near Nernstian potential linear range of 8.9×10^-6-1.0×10^-1 mol/L with a detection limit of 6. 1×10^-6 mol/L and a slope of 55.7 mV/dec, in pH5.0 of phosphorate buffer solution. The response mechanism is discussed in view of the alternating current impedance technique. These deviations result from the direct interaction between the central metal and the analyte ion and steric effect associated with the structure of the carrier. The electrode can be applied to medicine analysis and the result obtained is fair satisfying.

关 键 词：不对称双Schiff碱 中性载体 水杨酸根 离子选择性电极 

分 类 号：O657.1[理学—分析化学]