Magnetic field effects on electrochemical property of self-assembled monolayers with charge-transfer groups

Abstract

Novel self-organization molecules, n-mercapto-alkyl benzo-annelated tetrathiafulvalenes (BTTF), have been synthesized. Exposure of polycrystalline Au and oriented crystalline Au (111) surfaces to organic solution of the novel BTTF derivatives in high magnetic field results in the binding of the derivatives to Au and the formation of highly oriented self-assembled monolayers (SAMs) with redox active tetrathia-fulvalene (TTF) unit. The electrochemical properties were confirmed in the monolayer state. A comparison between the SAMs on polycrystalline Au having a rough surface and on oriented crystalline Au (111) having a flat surface suggested that the well-oriented alkyl-chain layers in the SAMs could be a blockade for the electron transfer between the TTF unit and the Au substrate.