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Evidence for tetranuclear bis-ยต-oxo cubane species in molecular iridium-based water oxidation catalysts from XAS analysis

DOI: 10.1039/C9CC02088H DOI Help

Authors: Stuart A. Bartlett (University of Southampton) , Emma V. Sackville (University of Bath) , Emma K. Gibson (UK Catalysis Hub, Research Complex at Harwell; University of Glasgow) , Veronica Celorrio (UK Catalysis Hub, Research Complex at Harwell) , Peter P. Wells (UK Catalysis Hub, Research Complex at Harwell; University of Southampton) , Maarten Nachtegaal (Paul Scherrer Institute) , Stafford W. Sheehan (Catalytic Innovations LLC) , Ulrich Hintermair (University of Bath)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemical Communications

State: Published (Approved)
Published: June 2019
Diamond Proposal Number(s): 10306 , 15151

Open Access Open Access

Abstract: The structure of a highly active pyridine-alkoxide iridium water oxidation catalyst (WOC) is examined by X-ray absorption spectroscopy (XAS). A detailed comparison with IrO2 points to a rigid molecular unit of low nuclearity, with the best analysis suggesting the existence of a novel tetrameric iridium-oxo cubane as the resting state.

Subject Areas: Chemistry

Instruments: B18-Core EXAFS

Other Facilities: Swiss Light Source