二氮杂四烯基金属配合物中性载体高选择性水杨酸根离子电极的研究

Studies on Diazetetraene Cobalt(Ⅱ) Metallic Complex as Neutral Carriers for the Preparation of Salicylate-Selective Ion Electrodes

首次研究了基于二氮杂四烯基钴(Ⅱ)金属配合物｛3,3′ [1,2 亚乙基(亚氨基次甲基)]二 2,4 戊二酮基合钴(Ⅱ)｝[Co(Ⅱ) EBIBP]为中性载体的阴离子选择性电极.该电极对水杨酸根(Sal-)呈现出优良的电位响应性能和选择性,且呈现出反Hofmeister序列行为,其选择性次序为Sal- I->SCN->NO-2 >SO2 -4 >NO-3>ClO-4 >Br->Cl-.采用交流阻抗技术和光谱分析技术研究了电极的响应机理.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的响应行为之间有非常密切的构效关系.并将电极用于药品分析。

Anion-selective electrode based on 3,3′-[ethenebis(imidogenmethin)]-bis-2,4-pentanedione cobalt(Ⅱ) metallic complex [Co(Ⅱ)-EBIBP] as the neutral carrier is described, which displays an anti-Hofmeister selectivity sequence with a preferential potentiometric response to salicylate. The selectivity sequence observed is Sal -I ->SCN ->NO -_2>SO 2-_4>NO -_3>ClO -_4>Br ->Cl -. The response mechanism is discussed in view of the alternating current impedance technique and the UV spectroscopy 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 has fair agreement with the result given by precipitation method.