Key points are not available for this paper at this time.
Two different molecules are selectively included in cucurbit8uril to form a stable 1:1:1 ternary complex, which has been characterized by X-ray crystallography. The inclusion of a hetero-guest pair (a pyridinium derivative (blue) and 2,6-dihydroxynaphthalene (magenta)) in the molecular host is driven and stabilized by a charge-transfer interaction between the electron-rich and electron-deficient guests.
Kim et al. (Tue,) studied this question.