四氯苯醌自组装膜电子传递机制的研究

Electron Transfer Mechanism Characteristics of 2,3,5,6-tetrachloride-quinone Anchored on the Self-assembled Monolayers of Dithiol

2,3,5,6-Tetrachloride-quinone was anchored to a gold surface through the self-assembled monolayers of dithiol DT HS-(CH2)n-SH n=2,4,6,8,10]. The surface coverage of the anchored TQ was esteminated to be 4.9 ×10-11 mol•cm-2. The electron transfer rate constant Ket associated with the redox process of anchored film decreased from 6.75 s-1 at n=2 to 0.169 s-1 at n=10 with increasing the chain length of the DT SAMs througth the redox potential of TQ. The turning barrier coefficient(β) of the electron transfer was estimated to be 0.82Å-1 from the observed linear relationship between the Ket and the monolayer chain length.