Metallocorroles as Catalysts for Small Molecule Activation

Woormileela Sinha w.sinha@technion.ac.il Zeev Gross
Schulich Faculty of Chemistry, Technion- Israel Institute of Technology, Technion City, Haifa, Israel

ABSTRACT

Nature has highly sophisticated mechanisms for activation of small molecules. For example, reduction of oxygen by the heme proteins and oxidation of water in the calcium manganese oxygen cluster of Photosystem II in green plants occur very efficiently. Researchers have led immense efforts in mimicking these naturally occurring catalytic processes in order to find suitable alternatives to fossil fuels. Efficient single-site catalysts using non-precious metals have caught the fancy of the researchers lately. Metallocorroles have been recently investigated to be relevant catalysts for the activation of small molecules. Cobalt corroles have already been proved to be particularly active in catalyzing the proton reduction, oxygen reduction reaction (ORR) as well as the water oxidation reactions (WOR).1-5 Our target is to develop catalysts based on first-row non-precious metals of cobalt, iron, etc. with corroles for the above-mentioned electrocatalytic processes. We have done a detailed study on the WOR using Co(tpfc), a 5,10,15-tris(pentafluorophenyl)corrole complex of Co under neutral homogeneous condition and further investigated the dramatic catalytic effects in potential on increasing the pH of the medium. We have also attempted to unravel the reactive intermediates involved in the WOR catalyzed by Co(tpfc) with the help of electrochemical, spectroelectrochemical and various spectroscopic techniques.6

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  6. W. Sinha, A. Mizrahi, A. Mahammed, B. Tumanskii and Z. Gross, Inorg. Chem., 2017, 10.1021/acs.inorgchem.7b02696.








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