用循环伏安法(CV)和电化学扫描隧道显微镜(ECSTM)在HClO4溶液中研究了配对碱基腺嘌呤(Adenine,A)与胸腺嘧啶(Thymine,T)在Au(111)电极上的共吸附行为。CV曲线表明,A和T的电化学共吸附行为更接近于A的电化学吸附行为。高分辨STM图像显示,在物理吸附区域碱基A和T分子之间通过氢键作用形成一种不同于单组分的网络结构。根据STM图像提出一个可能的模型,并给出了在Au(111)电极上共吸附时A和T分子之间可能的氢键作用方式。
The coadsorption behavior of two complementary DNA bases, adenine (A) and thymine ( T), was studied on Au ( 111 ) electrode by cyclic vohammetry (CV) and electrochemical scanning tunneling microscopy (ECSTM) in aqueous solution. From the CVs, the coadsorption behavior of A and T was more closed to the adsorption behavior of A. In the potential range of physisorption, high- resolution ECSTM images of revealed that a new super-structure was formed by the hydrogen bonds between A and T. A molecular model of the super-structure was proposed based on the STM results and the possible hydrogen bonds between A and T.