X-ray crystal structures of three differently solvated forms of potassium pentaphenyl[60]fullerene, K(C60Ph5)(thf)3, [K(thf)6][C60Ph5], and [K(18-crown-6)(dmf)][C60Ph5], indicate that the potassium cation and the fullerene cyclopentadienide become separated easily by cation solvation, and suggest that a solvent-separated ion pair is responsible for the formation of bilayer vesicles upon dissolution of KC60Ph5 in water.
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Matsuo et al. (2005) studied this question.
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