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A single-crystal X-ray structure determination of the main isomer of C 60 F 18 O shows it to be an intramolecular fullerene ether rather than an epoxide, and thus the first example of an oxa-homo[60]fullerene.

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Ipsocentric current-density maps for a fluorofullerene derivative, C60F15H3, modelling the addition pattern of the experimentally characterised C60F15[CBr(CO2Et)2]3 which contains an [18]trans-annulene system, reveal a diamagnetic ring current dominated by the contribution of the four HOMO electrons, as in a classical (4n + 2) aromatic annulene.