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Host-Guest Induced Electron Transfer Triggers Radical-Cation Catalysis.

07:00 EST 14th January 2020 | BioPortfolio

Summary of "Host-Guest Induced Electron Transfer Triggers Radical-Cation Catalysis."

Modifying the reactivity of substrates by encapsulation is a fundamental principle of capsule catalysis. Here we show an alternative strategy, wherein catalytic activation of otherwise inactive quinone "co-factors" by a simple PdL capsule pro-motes a range of bulk-phase, radical-cation cycloadditions. Solution electron transfer experiments and cyclic voltammetry show the cage anodically shifts the redox potential of the encapsulated quinone by a significant 1 V. Moreover, the capsule also protects the reduced semiquinone from protonation, thus transforming the role of quinones from stoichiometric oxidants into catalytic single electron acceptors. We envisage that the host-guest induced release of an "electron hole" will translate to various forms of non-encapsulated catalysis that involve other difficult to handle, highly reactive species.

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This article was published in the following journal.

Name: Journal of the American Chemical Society
ISSN: 1520-5126
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