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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Surface-Active Ionic Liquids in Catalytic Water Splitting

Alice Cognigni A , Ádám Márk Palvögyi A , Christian Schröder B , Herwig Peterlik C , Alexander R. M. Müllner C , Ronald Zirbs D , Matthias Weil E and Katharina Bica A F
+ Author Affiliations
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A Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9/163, 1060 Vienna, Austria.

B University of Vienna, Faculty of Chemistry, Department of Computational Biological Chemistry, Währingerstrasse 17, 1090 Vienna, Austria.

C Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria.

D Institute for Biologically Inspired Materials, Department of Nanobiotechnology (DNBT), University of Natural Resources and Life Sciences, Vienna, Muthgasse 11-II, 1190 Vienna, Austria.

E Institute for Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164, 1060 Vienna, Austria.

F Corresponding author. Email: katharina.schroeder@tuwien.ac.at

Australian Journal of Chemistry 72(2) 34-41 https://doi.org/10.1071/CH18104
Submitted: 10 March 2018  Accepted: 29 April 2018   Published: 18 July 2018

Abstract

We report the application of surface-active ionic liquids as ligands and optional reaction media in iridium-catalyzed water oxidations. Three novel catalysts with N,N-dialkylimidazolidin-2-ylidene ligands based on amphiphilic imidazolium ionic liquids were synthesized and characterized. Excellent turn-over frequencies of up to 0.92 s−1 were obtained in catalytic water splitting, and activity was maintained for five consecutive catalytic cycles, with an overall turn-over number of 8967. The addition of external surface-active ionic liquid showed unexpected behaviour, because strongly enhanced initial reaction rates were observed.


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