We describe here regulated electrochemistry of C60 embedded in a cast film of an artificial lipid, dibexadecyldimethylammonium poly(styrene sulfonate) (1) on an electrode, The X-ray diffraction diagram for a cast film of C60/1 (molar ratio, 1/19) showed a diffraction peak at 2θ = 1.8° suggesting that the film forms multibilayer structure with the molecular layers tilting by 47° from the basal plane. Phase-transition temperature for a cast film of 1/C60 (molar ratio, 1/19) in the presence of water determined by differential scanning calorimetry was 27°C, which was almost identical with that of the single component of 1. At temperatures above the phase transition, a cast film of C60/1 on a basal plane pyrolytic graphite electrode in aqueous solution gave quasi-reversible two-consecutive one-electron-transfer processes leading to C602- with the formal potential of E10′ = -0.35 V and E20′ = -0.99 V vs SCE corresponding to C60/C60•- and C60•-/ C602-, respectively. At temperatures below the phase-transition temperatures, the redox current for the electrode was very small or nondetectable. This temperature dependence was reversible; that is, temperature-driven "on-off" switching of C60 electrochemistry was possible. The observed phenomenon would be applicable to C60-derivatives, higher fullerenes, and metallofullerenes. The present study opens possibilities for the construction of fullerene/artificial lipid electrical devices based on the nature of self-organized lipid bilayer membranes.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry