Abstract
Quasi-reversible single electron transfer (ET) kinetics of methylviologen partly-included at the rim of 4-sulfonatocalix[n]arenes (n = 4,6 and 8) has been investigated in aqueous solution. ET rates were measured by Nicholson method with relatively large potential scan rates (0.9 V/s < v < 50 V/s). ET proceeded adiabatically on the direct collision between the MV+/MV2+ and the electrode surface. The host-guest binding equilibrium at the activation state was not established under the high-speed cyclic voltammetry condition. The non-equilibrium stabilization energy was independent of the size of the cavitands. The activation energy of ET under the partly-included condition was 70–80% of that without any inclusion.
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