Journal
CURRENT ORGANIC CHEMISTRY
Volume 15, Issue 1, Pages 27-38Publisher
BENTHAM SCIENCE PUBL LTD
DOI: 10.2174/138527211793797800
Keywords
Host-guest complexes; electrochemistry; cucurbituril hosts; ferrocene; cobaltocenium; viologen
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This review summarizes recent work on the chemistry of inclusion complexes formed between redox active guests and cucurbit[n]uril hosts. The large majority of the surveyed research concerns the hosts cucurbit[7] uril (CB7) and cucurbit[8] uril (CB8), while the guests are 4,4'-bipyridinium (viologen) and ferrocene derivatives. The work includes dendronized guests, in which a guest residue is attached to a dendron in such a way that host-guest binding interactions are still possible. The main focus of the review is on the electrochemical behavior of the included guests. In general terms complexation by CB7 has a more pronounced effect on the ferrocene derivatives, giving rise to a measurable attenuation of the electrochemical kinetics. In contrast to this, the electrochemical kinetics of the viologen derivatives remains fast (in the voltammetric time scale, with scan rates up to 2 V s(-1)) upon inclusion complexation by CB7. The larger cavity host CB8 is extremely effective at mediating the redox-driven self-assembly of dendronized viologens.
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