V. Ohlendorf et al., PK(A) OF SINGLY REDUCED C-60 ENCAPSULATED IN GAMMA-CYCLODEXTRIN, Journal of the Chemical Society, Chemical Communications, (7), 1995, pp. 759-760
The pK(a) of singly reduced C-60 encapsulated in gamma-cyclodextrin an
d dissolved in water-propan-2-ol is determined to be 4.5 (+/-0.5) on t
he basis of a specific IR absorption band for C-60(.-)-gamma-CD.