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Proton-Coupled Electron Transfer Kinetics for the Photoinduced Generation of a Cobalt(III)-Hydride Complex

Proton-Coupled Electron Transfer Kinetics for the Photoinduced Generation of a Cobalt(III)-Hydride Complex

Daniel A Kurtz, Jillian L Dempsey

Inorg Chem. 2019 Dec 16;58(24):16510-16517.

PMID: 31755267

Abstract:

Studying the formation of transition metal hydride complexes via proton-coupled electron transfer is important for developing next-generation molecular catalysts for hydrogen evolution. We report herein the study of stepwise photoinduced reduction and protonation of [CoIICp(dppe)]+ (Cp = cyclopentadienyl, dppe = 1,2-bis(diphenylphosphino)ethane) to form the corresponding hydride complex [HCoIIICp(dppe)]+. Reaction intermediates were optically tracked using transient absorption spectroscopy, and a combination of experimental fitting and kinetic simulations was used to determine apparent rate constants for electron transfer and proton transfer with a range of acid sources. A linear free energy relationship is observed between measured apparent proton transfer rate constants and acid strength, but marked differences from previously electrochemically determined protonation rate constants are found. These deviations, which stem from ground-state reactivity present in photochemical experiments, highlight the challenges in comparing mechanistic studies using different techniques.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1277436	Bis(cyclopentadienyl)cobalt(II)		1277-43-6	Price

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