Electrochemical studies of calixarene-[60]fullerene inclusion processes

[60]Fullerene (C₆₀)-calix[n]arene interactions were studied in toluene : MeCN = 10 : 1 (v/v) using an electrochemical method. In the presence of homooxacalix[3]arenes and calix[5]arenes, both E_pe and E_pa shifted to the negative potential, whereas they were scarcely affected by the addition of calix[4]arenes. The K₂ values electrochemically determined for the association with C₆₀. are generally smaller than the K₁ values spectroscopically determined for the association with C₆₀. The tendency indicates that the charge-transfer-type interaction is one of the driving forces for C₆₀ inclusion.