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| - Binding Modes of Cucurbit[6]uril andCucurbit[7]uril with a Tetracationic Bis(viologen)Guest
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| - Binding behaviors of two cucurbit[n]urils (CB[n]) hosts withthe [CH3bpy(CH2)6bpyCH3]4+ (bpy = 4,4‘-bipyridinium)guest were investigated by 1H NMR and MALDI-TOF-MSexperiments. While the CB[6] and CB[7] form [2]pseudorotaxanes with the host located over the hexamethylene chainof the guest, only the CB[7] forms a [3]pseudorotaxane withboth host molecules residing over the bipyridinium groups.The initial CB[7] host vacates the inclusion of the hexamethylene chain as a result of the electrostatic and stericrepulsions that would arise in simultaneous binding ofadjacent aliphatic and aromatic portions of the guest.
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