Electrochemical behavior of films of C-60-dimethyl-(beta-cyclodextrin) (1 : 1 and 1 : 2) inclusion complexes in mixed water and acetonitrile solutions

Two inclusion complexes, i.e. C-60-dimethyl-(beta-cyclodextrin) and C-60-[dimethyl-(beta-cyclodextrin)](2), have been prepared by kneading and characterized by UV-vis and IR spectroscopy. Electrochemical behavior of their films has been studied by cyclic voltammetry (CV). The CVs are quite different from those for a pristine C-60 film. The CVs of films of both complexes are similar in a mixed solvent solution of water and acetonitrile (3:2, v/v) containing tetra-n-butylammonium perchlorate as supporting electrolyte. These CVs are characterized by one two-electron electroreduction peak and two one-electron electro-oxidation peaks when the rate is above 0.1 V s(-1). The one electroreduction peak of both films splits into two peaks if the potential scan rate is lower than 0.1 V s(-1). (C) 2000 Elsevier Science Ltd. All rights reserved.