Coadsorption of Adenine and Thymine on Au(111) Electrode / 分析化学

The coadsorption behavior of two complementary DNA bases,adenine(A) and thymine(T),was studied on Au(111) electrode by cyclic voltammetry(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.