The cyclic voltammetry of a series of soluble N-methylfulleropyrrolidinium salts shows that these materials are
better electron-acceptors than unmodi®ed C60. The stability of mono-reduced, zwitterionic, and doubly-reduced
anionic species, produced either electrochemically or chemically, has been checked by absorption spectroscopy.
Langmuir±Blodgett (LB) layers of the C60 derivatives mixed with tricosanoic acid have been built up on
different substrates. The optical properties of the ®lms have been characterized using absorption spectroscopy
and their structure was investigated by X-ray diffraction.
