Energetic Effects of a Closed System Approach Including Explicit Proton and Electron Acceptors as Demonstrated by a Mononuclear Ruthenium Water Oxidation Catalyst. Issue 20 (28th August 2018)

• Record Type: Journal Article
• Authors: de Ruiter, Jessica M.; de Groot, Huub J. M.; Buda, Francesco
• Is Part Of: ChemCatChem. Volume 10:Issue 20(2018)
• Page Start: 4594
• Page End: 4601
• Publication Date: 2018-08-28
• Subjects: density functional calculations -- ab-initio molecular dynamics -- homogeneous catalysis -- proton-coupled electron transfer -- water splitting; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201801093
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: When considering water oxidation catalysis theoretically, accounting for the transfer of protons and electrons from one catalytic intermediate to the next remains challenging: correction factors are usually employed to approximate the energetics of electron and proton transfer. Here these energetics were investigated using a closed system approach, which places the catalytic intermediate in a simulation box including proton and electron acceptors, as well as explicit solvent. As a proof of principle, the first two catalytic steps of the mononuclear ruthenium‐based water oxidation catalyst [Ru(cy)(bpy)(H2 O)] 2+ were examined using Car‐Parrinello Molecular Dynamics. This investigation shows that this approach offers added insight, not only into the free energy profile between two stable intermediates, but also into how the solvent environment impacts this dynamic evolution. Abstract : The simulation box : Proton and electron transfer are examined independently for an explicitly solvated catalyst, allowing for an evaluation of the free energy profile during the course of the reaction process.