Key points are not available for this paper at this time.
The binding stoichiometry of a host-guest complex can be effectively controlled by the redox chemistry of the guest: a 1:1 inclusion complex of methylviologen dication (MV2+) in cucurbit8uril (CB8) converts completely and reversibly to a 2:1 inclusion complex of cation radical (MV+.) in CB8 upon the reduction of the guest.
Jeon et al. (Tue,) studied this question.