ELECTROCHEMICAL REDUCTION OF C-60 AND C-70 FILMS IN N(ME)(4)(CLO4) MECN/

The electrochemical behavior of C-60 and C-70 films on glassy carbon e lectrode with tetramethylammonium perchlorate in acetonitrile solution was investigated by cyclic voltammetry(CV). The cyclic voltammogram o f such films showing an unusual hysteresis suggested that large struct ural changes occur on reduction. We described the first well-resolved cyclic voltammogram of C-60 and C-70 films with small size cations N(C H3)(4)(+) by using an ultramicroelectrochemical cell technique. These results, accompanied by electrochemical quartz crystal microbalance(EQ CM) method, led the doping process of NR4+ and dissolution process of fulleride being able to be characterized in detail to understand the s tructures as well as phases of doped films. Different phases of doped C-60 and C-70 films, such as C-60(n-)(NR4+)(m) and C-70(n-)(NR4+)(m) ( n = 1,2; m = 0,1,2), were proposed to investigate two reduction peaks of fullerene from neutral to -2 charge.