Simultaneous Electron Transfer from Free and Intercalated 4-benzoylpyridinium Cations in Cucurbituril
N-Substituted 4-benzoylpyridinium monocations form stable host−guest complexes with cucurbituril (CB) in DMSO (Keq ≈ 0.6−1.9 × 103 M−1). Observation of simultaneous reversible and quasi-reversible e-transfer processes from the free and intercalated quests, respectively, is attributed to the pre-e-transfer host−guest equilibrium. The standard rate constant for Me-BP@CB (ks = 1.0 × 10−4 cm·s−1) reflects e-transfer across 5.7 Å, corresponding to the distance of the intercalated guest from the outmost perimeter of CB (5.3 Å).
A. Thangavel et al., "Simultaneous Electron Transfer from Free and Intercalated 4-benzoylpyridinium Cations in Cucurbituril," Organic Letters, American Chemical Society (ACS), Mar 2009.
The definitive version is available at https://doi.org/10.1021/ol9002459
University of Missouri Research Board
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