Theoretical Study of C–H Bond Cleavage via Concerted Proton-Coupled Electron Transfer in Fluorenyl-Benzoates
Abstract
Developing new strategies to activate and cleave C–H bonds is crucial for a broad range of applications. Currently a new method for C–H bond activation using multi-site concerted proton-coupled electron transfer (PCET) involving intermolecular electron transfer to an oxidant coupled to intramolecular proton transfer was reported. For a series of oxidants reacting with 2-(9H-fluoren-9-yl)benzoate, experimental studies revealed an atypical Brønsted α, defined as the slope of the logarithm of the PCET rate constant versus the logarithm of the equilibrium constant or the scaled driving force. Herein this reaction is modeled with a vibronically nonadiabatic PCET theory. Hydrogen tunneling, thermal sampling of the proton donor–acceptor mode, solute and solvent reorganization, and contributions from excited vibronic states are found to play important roles. The calculations qualitatively reproduce the experimental observation of a Brønsted α significantly less than 0.5 and explain this shallow slope in terms of exoergic processes between pairs of electron–proton vibronic states. These fundamental mechanistic insights may guide the design of more effective strategies for C–H bond activation and cleavage.
- Authors:
-
- Yale Univ., New Haven, CT (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Energy Frontier Research Center (EFRC) Center for Molecular Electrocatalysis (CME)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institutes of Health (NIH)
- OSTI Identifier:
- 1566592
- Grant/Contract Number:
- AC05-76RL01830
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Chemical Society
- Additional Journal Information:
- Journal Volume: 140; Journal Issue: 46; Journal ID: ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Sayfutyarova, Elvira R., Goldsmith, Zachary K., and Hammes-Schiffer, Sharon. Theoretical Study of C–H Bond Cleavage via Concerted Proton-Coupled Electron Transfer in Fluorenyl-Benzoates. United States: N. p., 2018.
Web. doi:10.1021/jacs.8b10461.
Sayfutyarova, Elvira R., Goldsmith, Zachary K., & Hammes-Schiffer, Sharon. Theoretical Study of C–H Bond Cleavage via Concerted Proton-Coupled Electron Transfer in Fluorenyl-Benzoates. United States. https://doi.org/10.1021/jacs.8b10461
Sayfutyarova, Elvira R., Goldsmith, Zachary K., and Hammes-Schiffer, Sharon. Thu .
"Theoretical Study of C–H Bond Cleavage via Concerted Proton-Coupled Electron Transfer in Fluorenyl-Benzoates". United States. https://doi.org/10.1021/jacs.8b10461. https://www.osti.gov/servlets/purl/1566592.
@article{osti_1566592,
title = {Theoretical Study of C–H Bond Cleavage via Concerted Proton-Coupled Electron Transfer in Fluorenyl-Benzoates},
author = {Sayfutyarova, Elvira R. and Goldsmith, Zachary K. and Hammes-Schiffer, Sharon},
abstractNote = {Developing new strategies to activate and cleave C–H bonds is crucial for a broad range of applications. Currently a new method for C–H bond activation using multi-site concerted proton-coupled electron transfer (PCET) involving intermolecular electron transfer to an oxidant coupled to intramolecular proton transfer was reported. For a series of oxidants reacting with 2-(9H-fluoren-9-yl)benzoate, experimental studies revealed an atypical Brønsted α, defined as the slope of the logarithm of the PCET rate constant versus the logarithm of the equilibrium constant or the scaled driving force. Herein this reaction is modeled with a vibronically nonadiabatic PCET theory. Hydrogen tunneling, thermal sampling of the proton donor–acceptor mode, solute and solvent reorganization, and contributions from excited vibronic states are found to play important roles. The calculations qualitatively reproduce the experimental observation of a Brønsted α significantly less than 0.5 and explain this shallow slope in terms of exoergic processes between pairs of electron–proton vibronic states. These fundamental mechanistic insights may guide the design of more effective strategies for C–H bond activation and cleavage.},
doi = {10.1021/jacs.8b10461},
journal = {Journal of the American Chemical Society},
number = 46,
volume = 140,
place = {United States},
year = {Thu Nov 01 00:00:00 EDT 2018},
month = {Thu Nov 01 00:00:00 EDT 2018}
}
Web of Science
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