Velocity ultracentrifugation method was employed to study aqueous solutions of fullerene C 60 and poly(N-vinylpyrrolidone) complex (PVP-C 60 ). Strong dependence of sedimentation coefficient S 0 on ultracentrifuge rotor speed n was found. The S 0 value increases as the value of n decreases from that corresponding to isolated PVP-C 60 macromolecules to the value that the clusters of PVP-C 60 (registered by the light-scattering method) would have at n!0. This dependence indicates that molar mass and size of clusters change depending on the centrifugal field applied.
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