This paper presents some useful results filling the gap in the knowledge about the aggregation of hydroxylated endohedral fullerene Gd@C82(OH)18(contrast agent for magnetic resonance imaging) in aqueous solutions at different pH. A supramolecular ordering study by small-angle neutron scattering has shown that fullerenols exist in cluster form (correlation radius RC ∼ 20–30 nm, fractal dimension D). At pH increasing from 4–5 to 7–8 there was observed a transition from dense branched structures (D ∼ 2.5) to rare coil-like objects (D ∼ 1.5).
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Lebedev et al. (2010) studied this question.
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