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Iridium complexes for electrocatalysis

United States Patent

October 17, 2017
View the Complete Patent at the US Patent & Trademark Office
Solution-phase (e.g., homogeneous) or surface-immobilized (e.g., heterogeneous) electrode-driven oxidation catalysts based on iridium coordination compounds which self-assemble upon chemical or electrochemical oxidation of suitable precursors and methods of making and using thereof are. Iridium species such as {[Ir(LX).sub.x(H.sub.2O).sub.y(.mu.-O)].sub.z.sup.m+}.sub.n wherein x, y, m are integers from 0-4, z and n from 1-4 and LX is an oxidation-resistant chelate ligand or ligands, such as such as 2(2-pyridyl)-2-propanolate, form upon oxidation of various molecular iridium complexes, for instance [Cp*Ir(LX)OH] or [(cod)Ir(LX)] (Cp*=pentamethylcyclopentadienyl, cod=cis-cis,1,5-cyclooctadiene) when exposed to oxidative conditions, such as sodium periodate (NaIO.sub.4) in aqueous solution at ambient conditions.
Sheehan; Stafford Wheeler (Tiverton, RI), Hintermair; Ulrich (Rottendorf, DE), Thomsen; Julianne M. (Colton, CA), Brudvig; Gary W. (Orange, CT), Crabtree; Robert H. (Bethany, CT)
Yale University (New Haven, CT)
14/ 317,906
June 27, 2014
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with government support under 1119826 and 1122492 awarded by National Science Foundation and under DE-FG02-07ER15909 awarded by Department of Energy and under GM008283 awarded by National Institutes of Health. The government has certain rights in the invention.