Repository logo

XAS and EPR in Situ Observation of Ru(V) Oxo Intermediate in a Ru Water Oxidation Complex

Published version

Change log


Levin, Natalia 
Casadevall, Carla 
Cutsail, George E., III 
Lloret‐Fillol, Julio 
DeBeer, Serena 


Abstract: In this study, we combine in situ spectroelectrochemistry coupled with electron paramagnetic resonance (EPR) and X‐ray absorption spectroscopies (XAS) to investigate a molecular Ru‐based water oxidation catalyst bearing a polypyridinic backbone [RuII(OH2)(Py2Metacn)]2+. Although high valent key intermediate species arising in catalytic cycles of this family of compounds have remain elusive due to the lack of additional anionic ligands that could potentially stabilize them, mechanistic studies performed on this system proposed a water nucleophilic attack (WNA) mechanism for the O−O bond formation. Employing in situ experimental conditions and complementary spectroscopic techniques allowed to observe intermediates that provide support for a WNA mechanism, including for the first time a Ru(V) oxo intermediate based on the Py2Metacn ligand, in agreement with the previously proposed mechanism.


Funder: Max-Planck-Gesellschaft; Id:

Funder: ICIQ Fundation


Communication, Communications, spectroelectrochemistry, water oxidation, ruthenium, catalyst, in situ electrochemistry

Journal Title


Conference Name

Journal ISSN


Volume Title


Mountain Equipment Co-op (FPU14/02550)
European Research Council (FP7-PEOPLE-2010-ERG-268445)
Ministerio de Ciencia e Innovación (PID2019-110050RB-I00)