Abstract
Evolution of the electronic absorption and photoluminescence spectra of the fullerene C60 solutions with various concentrations in a polar solvent (N-methylpyrrolidone) was studied. Comparison with the electrooptical properties of these solutions shows that a slow (associative) fullerene-solvent interaction mechanism is operative at large (nearly saturating) concentrations (1×10−3 g/cm3), whereas the solutions of relatively low concentration (less than 5×10−4 g/cm3) exhibit fast complex formation between fullerene and the solvent molecules. The latter interaction significantly changes the electronic structure of fullerene.
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