N,N’-二(5-溴亚水杨基)-2,6-吡啶二氨铜(Ⅱ)配合物为载体的高选择性硫氰酸根离子电极的研制(英文)  

Preparation of a Highly Selective Thiocyanate Electrode with N,N'-bis(5-Bromosalicylidene) 2,6-Pyridinediamine Copper(Ⅱ) Complex as the Carrier

作　　者：孙志勇[1] 冯丽娟[1] 向灿辉[1] 

机构地区：[1]遵义医学院珠海校区化学教研室,广东珠海519041

出　　处：《西南大学学报（自然科学版）》2010年第1期68-72,共5页Journal of Southwest University(Natural Science Edition)

基　　金：遵义医学院珠海校区科研启动基金资助项目(KY200604)

摘　　要：首次研究以N,N’-二(5-溴亚水杨基)-2,6-吡啶二氨铜(Ⅱ)配合物为载体的PVC膜电极,其对硫氰酸根离子(SCN-)具有优良的电位响应特性并呈现出反Hof meister选择性行为,其选择性从大到小次序为:SCN-,I-,Cl O4-,Sal-,Br-,NO2-,Cl-,SO32-,NO3-,SO24-.电极在pH=5.0的磷酸盐缓冲体系中,对SCN-在1.0×10-1～4.0×10-6mol/L浓度范围内呈近能斯特响应,斜率为58.5 mV/dec(25℃),检测下限为2.0×10-6mol/L.采用交流阻抗技术和紫外可见光谱技术初步研究了阴离子与载体的作用机理,结果表明电极的反Hof meister选择性行为与配合物中心金属原子的结构以及载体本身的结构有非常密切的构效关系.该电极具有制备简单、响应快、重现性好、检测限低等优点.将电极应用于实验室废水和人的尿液样品分析,结果令人满意.A new highly selective thiocyanate electrode based on N,N＇-bis（5-bromosalicylidene）-2,6-pyridinediamine copper（Ⅱ） complex [Cu（Ⅱ）-BBSPD] as the neutral carrier is described.The electrode has an anti-Hofmeister selectivity sequence： SCN^-,I^-,Cl O4^-,Sal^-,Br^-,NO2^-,Cl^-,SO3^2-,NO3^-,SO4^2-. and a near-Nernstian potential linear range for thiocyanate from 1.0×10^-1 to 4.0×10^-6 mol/L with a detection limit of 2.0×10^-6 mol/L and a slope of 58.5 mV/decade in pH=5.0 of phosphorate buffer solution at 25 ℃.The response mechanism was discussed on the basis of the results from AC impedance measurement and UV spectroscopy.The anti-Hofmeister behaviour of the electrode was found to 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 had the advantages of simplicity,fast response,fair stability and reproducibility,and low detection limit.Application of the electrode to the determination of thiocyanate in wasted water samples from a laboratory and in human urine samples yielded satisfactory results.

关 键 词：N N’-二(5-溴亚水杨基)-2 6-吡啶二氨铜(Ⅱ)配合物 硫氰酸根离子 离子选择性电极 

分 类 号：O657.15[理学—分析化学]