Abstract : A viologen–phenylene–imidazole (VPI) conjugate, previously shown to be singly complexed by CB[7] and doubly bound by CB[8], is herein shown to form antiparallel triple stacks in water with cucurbit[10]uril (CB[10]), pairwise complexing the guest trimer. The quinary host:guest 2:3 complex showed features assignable to charge-transfer interactions. Under reductive conditions, CB[10] could solubilize a VPI radical, even though CB[10] and reduced VPI are almost insoluble, thereby illustrating a possible new application for CB[10].
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Fengbo Liu, Shagor Chowdhury, Roselyne Rosas, Valérie Monnier, Laurence Charles, et al.. Triple Stack of a Viologen Derivative in a CB[10] Pair. Organic Letters, American Chemical Society, 2021, ⟨10.1021/acs.orglett.1c00773⟩. ⟨hal-03227458⟩