Solution structures of highly active molecular ir water-oxidation catalysts from density functional theory combined with high-energy X-ray scattering and EXAFS spectroscopy

Ke R. Yang, Adam J. Matula, Gihan Kwon, Jiyun Hong, Stafford W. Sheehan, Julianne M. Thomsen, Gary W Brudvig, Robert H. Crabtree, David M. Tiede, Lin X. Chen, Victor S. Batista

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37 Citations (Scopus)

Abstract

The solution structures of highly active Ir water-oxidation catalysts are elucidated by combining density functional theory, high-energy X-ray scattering (HEXS), and extended X-ray absorption fine structure (EXAFS) spectroscopy. We find that the catalysts are Ir dimers with mono-μ-O cores and terminal anionic ligands, generated in situ through partial oxidation of a common catalyst precursor. The proposed structures are supported by 1H and 17O NMR, EPR, resonance Raman and UV-vis spectra, electrophoresis, etc. Our findings are particularly valuable to understand the mechanism of water oxidation by highly reactive Ir catalysts. Importantly, our DFTEXAFS-HEXS methodology provides a new in situ technique for characterization of active species in catalytic systems.

Original languageEnglish
Pages (from-to)5511-5514
Number of pages4
JournalJournal of the American Chemical Society
Volume138
Issue number17
DOIs
Publication statusPublished - May 4 2016

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ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

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