Ultrafast excimer formation and solvent controlled symmetry breaking charge separation in the excitonically coupled subphthalocyanine dimer

Roy, Palas, Bressan, Giovanni, Gretton, Jacob, Cammidge, Andrew N. and Meech, Stephen R. (2021) Ultrafast excimer formation and solvent controlled symmetry breaking charge separation in the excitonically coupled subphthalocyanine dimer. Angewandte Chemie International Edition, 60 (19). pp. 10568-10572. ISSN 1433-7851

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Abstract

Knowledge of the factors controlling excited state dynamics in excitonically coupled dimers and higher aggregates is critical for understanding natural and artificial solar energy conversion. In this work we report ultrafast solvent polarity dependent excited state dynamics of the structurally well‐defined subphthalocyanine dimer, μ‐OSubPc 2 . Stationary electronic spectra demonstrate strong exciton coupling in μ‐OSubPc 2 . Femtosecond transient absorption measurements reveal ultrafast excimer formation from the initially excited exciton, mediated by intramolecular structural evolution. In polar solvents the excimer state decays directly through symmetry breaking charge transfer to form a charge separated state. Charge separation occurs under control of solvent orientational relaxation.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
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Depositing User: LivePure Connector
Date Deposited: 05 Mar 2021 00:44
Last Modified: 30 Sep 2021 16:16
URI: https://ueaeprints.uea.ac.uk/id/eprint/79385
DOI: 10.1002/anie.202101572

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