T. Sternfeld et al., H-1 NMR of C61H26-: the aromatic character of C-60 upon reduction - a viewfrom the bridge of C61H2, CHEM COMMUN, (23), 1999, pp. 2411-2412
The H-1 NMR spectrum of the fulleroid C61H26- consists two high field doubl
ets, providing experimental evidence for diamagnetic five-membered rings in
C-60(6-).