Abstract
ABSTRACT Cucurbit[10]uril (CB[10]) is found to form stable host-guest complexes with tetracationic cyclophanes in H2O and DMSO. Upon encapsulation in CB[10], the affinity of cyclophanes towards anions is weakened, due to electronegative carbonyl oxygens on CB[10] providing charge repulsion environment, and encapsulation fixing the conformation of cyclophanes. Interestingly, these complexes show positively cooperative effects towards neutral phenol guests to form heteroternary complexes. The driving force for the formation of heteroternary inclusion complexes is multiple hydrogen bonding interactions confirmed by X-ray single crystal analysis, as well as hydrophobic effects.
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