New Ir Bis-Carbonyl Precursor for Water Oxidation Catalysis

Huang, Daria L.; Beltrán-Suito, Rodrigo; Thomsen, Julianne M.; Hashmi, Sara M.; Materna, Kelly L.; Sheehan, Stafford W.; Mercado, Brandon Q.; Brudvig, Gary W.; Crabtree, Robert H.

doi:10.1021/acs.inorgchem.5b02809

New Ir Bis-Carbonyl Precursor for Water Oxidation Catalysis

Journal Article · Mon Feb 22 00:00:00 EST 2016 · Inorganic Chemistry

DOI:https://doi.org/10.1021/acs.inorgchem.5b02809· OSTI ID:1369720

Huang, Daria L. ^[1]; Beltrán-Suito, Rodrigo ^[1]; Thomsen, Julianne M. ^[1]; Hashmi, Sara M. ^[1]; Materna, Kelly L. ^[1]; Sheehan, Stafford W. ^[2]; Mercado, Brandon Q. ^[1]; Brudvig, Gary W. ^[1]; Crabtree, Robert H. ^[1]

Yale Univ., New Haven, CT (United States)
Catalytic Innovations LLC, Adamsville, RI (United States)

This paper introduces Ir^I(CO)₂(pyalc) (pyalc = (2-pyridyl)-2-propanoate) as an atom-efficient precursor for Ir-based homogeneous oxidation catalysis. This compound was chosen to simplify analysis of the water oxidation catalyst species formed by the previously reported Cp*Ir^III(pyalc)OH water oxidation precatalyst. Here, we present a comparative study on the chemical and catalytic properties of these two precursors. Previous studies show that oxidative activation of Cp*Ir-based precursors with NaIO₄ results in formation of a blue Ir^IV species. This activation is concomitant with the loss of the placeholder Cp* ligand which oxidatively degrades to form acetic acid, iodate, and other obligatory byproducts. The activation process requires substantial amounts of primary oxidant, and the degradation products complicate analysis of the resulting Ir^IV species. The species formed from oxidation of the Ir(CO)₂(pyalc) precursor, on the other hand, lacks these degradation products (the CO ligands are easily lost upon oxidation) which allows for more detailed examination of the resulting Ir(pyalc) active species both catalytically and spectroscopically, although complete structural analysis is still elusive. Once Ir(CO)₂(pyalc) is activated, the system requires acetic acid or acetate to prevent the formation of nanoparticles. Investigation of the activated bis-carbonyl complex also suggests several Ir(pyalc) isomers may exist in solution. By ¹H NMR, activated Ir(CO)₂(pyalc) has fewer isomers than activated Cp*Ir complexes, allowing for advanced characterization. Future research in this direction is expected to contribute to a better structural understanding of the active species. A diol crystallization agent was needed for the structure determination of 3.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Argonne-Northwestern Solar Energy Research Center (ANSER); Energy Frontier Research Centers (EFRC) (United States). Center for Catalytic Hydrocarbon Functionalization (CCHF)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0001059; SC0001298

OSTI ID:: 1369720

Journal Information:: Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 5 Vol. 55; ISSN 0020-1669

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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