伏安法研究五元瓜环对Cu(Ⅱ)配合物的识别性能

Recognition Performance of Cucurbit[5]uril with Copper(Ⅱ) Complex by Voltammetry

利用伏安法研究了五元瓜环（记为Q[5]）对Cu（Ⅱ）配合物的识别性能。结果表明：在pH 5.0的Na2（H2EDTA）介质中,扫描速度为100 mV.s-1时,Q[5]-[Cu（H2EDTA）H2O]配合物的电极反应为单电子准可逆氧化还原反应。摩尔比法测出Q[5]与[Cu（H2EDTA）H2O]作用比为2∶1,稳定常数为3.59×109 L2.mol-2。在所选择的实验条件下,Cu（Ⅱ）浓度在2×10-6~1.6×10-4 mol.L-1范围内,峰电流与其浓度具有较好的线性关系,方法回收率为99.4%~100.7%。

Recognition performance of cucurbit[5]uril（Q[5]） with copper（Ⅱ） complex was investigated by voltammetry.The experimental results revealed that electrode reaction of Q[5]-[Cu（H2EDTA）H2O] complex is undergone an electron reversible redox reaction in a Na2（H2EDTA） solution at the 100 mV·s-1 scanning speed at pH 5.0.The data for the peak current versus mole ratio of Q[5] and Cu（Ⅱ） complex can be fitted to a 2∶1 coordination model of Q[5] to Cu（Ⅱ） complex with a stability constant of 3.59×109 L2·mol-2,and When the concentration of copper（Ⅱ） in the scope（2×10-6~1.6×10-4 mol·L-1）,the peak current and concentration of copper（Ⅱ） complex has good linear relationship under the selected experimental condition.Methods recovery is 99.4%~100.7%.