2,5-二(α-硫甲基吡啶)1,3,4噻二唑的电化学性质及离子识别性能研究

用循环伏安法和计时电量法等电化学方法研究了2,5-二(α-硫甲基吡啶)1,3,4噻二唑(DPTD)在玻碳电极(GCE)上的电化学行为.结果表明:在0.1 mol.L-1四丁基高氯酸铵(TBAP)的N,N-二甲基甲酰胺底液中于1.08 V(vs.SCE)处有一个不可逆的氧化峰,氧化峰电流与扫描速度的平方根(v1/2)呈良好的线性关系,表明DPTD在GCE上的伏安行为是一受扩散控制的不可逆电化学过程.利用电化学方法求出该电极反应过程是单电子转移,传递系数α为0.78,扩散系数为1.20×10-5cm2.s-1.利用循环伏安法还研究了该化合物对过渡金属离子的识别作用,发现该化合物在一定浓度下对Cu2+和Pb2+有较好的选择识别性.

Electrochemical Properties and Ion Recognition Character of 2,5-di(2'-methylpyridylthio)1,3,4-thiadiazole

The electrochemical behavior of 2,5-di(2'-methylpyridylthio) 1,3,4-thiadiazole(DPTD) on glassy carbon electrode is studied by cyclic voltammetry and chronocoulometry.Electrochemical results show that in 0.1 mol·L-1 TBAP DMF solution,DPTD have an irreversible oxidation peak at 1.08 V(vs.SCE).The oxidation peak currents are linear with the square root of the scan rate,which show that electrochemical behavior of DPTD on GCE is a diffuse-driven process.The electrode process involves single electron transfer reaction.The transfer coefficient α and the diffusion coefficient D are 0.78 and 1.20×10-5 cm2·s-1,respectively.The cyclic voltammetry has also been employed for the recognition study of DPTD to transition-metal ions.The results indicate that there is a well selective recognition of DPTD to Cu2+ and Pb2+ ions.