Inclusion of methylviologen in cucurbit[7]uril

AUTOR(ES)

Kim, Hee-Joon

FONTE

National Academy of Sciences

RESUMO

The inclusion behavior of methylviologen (N,N′-dimethyl-4,4′-bipyridinium, MV) dication in cucurbit[7]uril (CB[7]) has been studied by using various spectroscopic and electrochemical methods. The inclusion complex of MV dication in CB[7] is stable thermodynamically and kinetically. The electrochemical study reveals that unlike β-cyclodextrin, CB[7] prefers the charged species, MV dication (MV2+), and cation radical (MV+⋅) to the fully reduced neutral (MV0 species as guests. Dimerization of MV+⋅ is suppressed effectively by forming a stable complex with CB[7] in aqueous solution as confirmed by spectroelectrochemical experiments. Furthermore, the first redox process (MV2+/MV+⋅) of the MV2+–CB[7] complex occurs predominantly via the direct electron transfer pathway, whereas the second redox process (MV+⋅/MV0) occurs via both the direct and indirect pathway because of the low affinity of the fully reduced species MV0 to CB[7].

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