Aggregation of fullerene C-60 in N-methylpyrrolidone and N-methylmorpholine

Using translational diffusion, viscosimetry, and Kerr electrooptical techni ques, it was found that the properties of fullerene C-60 in the N-methylpyr rolidone and N-methylmorpholine media are determined by the duration of sto rage of the solutions. It was shown that, in these solvents, the fullerene passes into solution in the form of individual molecules, forming fullerene -solvent aggregates. The physical properties of these aggregates (the degre e of asymmetry and optical anisotropy) were found to vary with time.