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Bimetallic Iridium-Carbene Complexes with Mesoionic Triazolylidene Ligands for Water Oxidation Catalysis
Date Issued
2014-02
Date Available
2015-05-15T15:50:23Z
Abstract
Two new diiridium–triazolylidene complexes were prepared as bimetallic analogues of established mononuclear water oxidation catalysts. Both complexes are efficient catalyst precursors in the presence of cerium ammonium nitrate (CAN) as sacrificial oxidant. Up to 20000:1 ratios of CAN/complex, the turnover limitation is the availability of CAN and not the catalyst stability. The water oxidation activity of the bimetallic complexes is not better than the monometallic species at 0.6 mm catalyst concentration. Under dilute conditions (0.03 mm), the bimetallic complexes double their activity, whereas the monometallic complexes show an opposite trend and display markedly reduced rates, thereby suggesting a benefit of the close proximity of two metal centers in this low concentration regime. The high dependence of catalyst activity on reaction conditions indicates that caution is required when catalysts are compared by their turnover frequencies only.
Sponsorship
European Research Council
Science Foundation Ireland
Other Sponsorship
National Science Foundation
Type of Material
Journal Article
Publisher
Wiley
Journal
European Journal of Inorganic Chemistry
Volume
2014
Issue
4
Start Page
708
End Page
714
Copyright (Published Version)
2014 Wiley
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
File(s)
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Name
EurjIC_WOX_revsd.doc..pdf
Size
2.37 MB
Format
Adobe PDF
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