Host-guest induced electron transfer triggers radical-cation catalysis

Spicer, R. L., Stergiou, A., Young, T. A., Duarte, F., Symes, M. D. and Lusby, P. J. (2020) Host-guest induced electron transfer triggers radical-cation catalysis. Journal of the American Chemical Society, (doi: 10.1021/jacs.9b11273) (PMID:31935091)

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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 Pd2L4 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.

Item Type:Articles
Additional Information:The authors also acknowledge the following EPSRC Centers for Doctoral training: Critical Resource Catalysis (CRITICAT, EP/L016419/1) for a studentship for RLS, and Theory and Modelling in Chemical Sciences (EP/L015722/1) for a studentship to TAY generously supported by AWE.
Glasgow Author(s) Enlighten ID:Stergiou, Mr Athanasios and Symes, Professor Mark
Authors: Spicer, R. L., Stergiou, A., Young, T. A., Duarte, F., Symes, M. D., and Lusby, P. J.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Journal of the American Chemical Society
Publisher:American Chemical Society
ISSN (Online):1520-5126
Published Online:14 January 2020
Copyright Holders:Copyright © 2020 American Chemical Society
First Published:First published in Journal of the American Chemical Society 142(5):2134-2139
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
173495Driving energetically uphill processes using metal-ligand coordination complexesMark SymesThe Royal Society (ROYSOC)UF150104Chemistry