C_2 Isomers of C_(84)F_(40)and C_(84)F_(44)Are Cuboid and Contain Benzenoid and Naphthalenoid Aromatic Patches

摘要

A 1:1 mixture of C_(84)F_(40)and C_(84)F_(44),both derived from the D_2(IV)isomer,has been isolated from the flu-orination of[84]fullerene with either MnF_3 or CoF_3 at 500 deg C.The ID and 2D COSY ~(19)F NMR spectra showed that each derivative is cuboid,having benzenoid rings at four of the six octahedral sites;the two remaining sites have naphthalenoid rings for C_(84)F_(40),and two slightly offset benzenoid rings for C_(84)F_(44).The benzenoid rings each have six adjacent sp~3-hybridised carbon atoms whilst the naphthalenoid moieties have eight,thus facilitating full de-localisation.In terms of the number and size of aromatic patches,C_(84)F_(44)is the most aromatic fullerene derivative yet isolated.