Abstract: A fullerene derivative of the formula I ##STR1## where the symbols and indices have the following meanings: F is a fullerene radical of the formula (C.sub.20+2m), where m is a number from 1 to 50R.sup.1 to R.sup.8 are identical or different and are each H, CO.sub.2 R.sup.9, CN, COR.sup.10, Cl, Br, I, F, OR.sup.11, C.sub.1 -C.sub.20 -alkyl, phenyl or H, R.sup.1 -R.sup.4 and/or R.sup.5, R.sup.7 can also be part of a cycloalipathic, cycloaromatic or cycloheteroaromatic system which in turn is substituted by C.sub.1 -C.sub.20 -alkyl, aryl, carboxyl, carbonyl, alkoxy, aryloxy, halogen, nitro, alcohol or amine, or R.sup.1 and R.sup.2, R.sup.2 and R.sup.3, R.sup.3 and R.sup.4 can together be ##STR2## where R.sup.15 -R.sup.18 are each H, C.sub.1 -C.sub.20 -alkyl, F, Cl, Br, I or phenyl, andAR is the radical of a fused cyclo-aromatic system, and n is from 1 to 20 and a process for its preparation.