The self-assembly of bipyridinium bisthiol on the surface of optically-transparent platinum electrodes, and the electrochemical properties of the resulting film, are studied. The exposure of an optically-transparent platinum electrode to a solution of the chloride salt of bipyridinium bisthiol in chloroform-methanol for 1 h results the adsorption of the bisthiol on the solid substrate. The cyclic voltammogram recorded after rinsing the electrode with chloroform, methanol and water shows the characteristic waves for the reversible reduction of the bipyridinium bications to their radical cations. The studies demonstrate that bipyridinium bisthiols adsorb on surface of the optically-transparent platinum electrodes. The surface coverage of the resulting films can be regulated by controlling the exposure time of the solid substrate to the bisthiol solution. The absorption properties of these interfacial assemblies can be modulated by switching the redox state of the bipyridinium units.
ASJC Scopus subject areas
- Materials Chemistry