3,6-二氧杂-1,8-辛二硫醇-汞(Ⅱ)配合物修饰碳糊电极的制备及循环伏安行为研究

The Preparation of Mercaptan-Mercury(Ⅱ) Chemically Modified Carbon Paste Electrode and the Study of Its Cyclic Voltammetry Behavior

利用3,6-二氧杂-1,8-辛二硫醇(H2L)和HgC l2反应,得到组成为Hg3L2C l2的配合物。制备了Hg3L2C l2修饰的碳糊电极,研究了在1 mol/L KC l水溶液中的循环伏安行为。研究结果表明在1 mol/L KC l介质中,在0.3^-0.8 V(vs.SCE)范围内出现Hg3L2C l2的还原和L2-在汞膜表面的吸附,在-0.30~0.30 V范围内出现汞膜的氧化还原反应。

A kind of insoluble complex, Hg3L2Cl2, which was confirmed by element analysis and IR, was synthesized using 3,6-dioxa-1,8-octanedithiol（ H2L） and HgCl2. The chemically modified carbon paste electrode with Hg3 L2Cl2 was prepared and its cyclic voltammetry behavior was studied in aqueous 1 mol/L KCl supporting electrolyte. There were two reduction peaks and three oxidation peaks in the potential range of 0.3 V to -0. 8 V（vs. SCE）. The reduction peak of Hg3L2Cl2 is at -0. 688 V（vs. SCE）, with the oxidation peak is at -0. 650 V（vs. SCE）.