The hydrophilic vs. hydrophobic balance for five C60 derivatives (FD1–5) bearing one hydrophilic addend has been evaluated by means of useful descriptors derived from (i) aggregation measurements in aqueous/organic mixtures, (ii) partition measurements between n-octanol and water (log Pm/a), and (iii) retention factors in reverse-phase chromatography (log kw). Aggregates of FD1–5 have been obtained