A new class of hydrocarbon anions, pentaaryl- and penta-methylfullerene ani
ons R5C60- (R = Ph, 4-BuC6H4, 4-PhC6H4, Me) was found to be stable and solu
ble in water. Atomic force microscopic observation and dynamic light scatte
ring measurements indicated that the potassium salt Ph5C60K in water forms
spherical aggregates with an averaged radius of about 17 nm.