The selectivity and recognition behavior of cucurbit[n]uril (CB[n]) homologues (n=6,7,8) towards a ditopic guest containing two distinct binding sites is explored. CB6, CB7, and CB8 recognize and self-sort the binding sites according to their size, shape, and chemical nature. In the presence of both CB6 and CB8 a heteropseudorotaxane is formed.
Celtek, G., Artar, M., Scherman, O. A., & Tuncel, D. (2009). Sequence‐secific self‐sorting of the binding sites of a ditopic guest by cucurbituril homologues and subsequent formation of a hetero  pseudorotaxane. Chemistry : A European Journal, 15(40), 10360-10363. https://doi.org/10.1002/chem.200901504