Host-guest inclusion complexes of viologen derivative and tetramethyl cucurbit[6]uril with multiple interaction models

► The EV2+ cationic guest form stable inclusion complex with TMeQ[6] host. ► Pseudorotaxane and dumbbell-like structure between EV2+ and TMeQ[6] were found. ► TMeQ[6] cavity can accommodate the alkyl chain and the aromatic group simultaneously.