Particle formation during oxidation catalysis with Cp* iridium complexes

Ulrich Hintermair, Sara M. Hashmi, Menachem Elimelech, Robert H. Crabtree

Research output: Contribution to journalArticle

126 Citations (Scopus)

Abstract

Real-time monitoring of light scattering and UV–vis profiles of four different Cp*IrIII precursors under various conditions give insight into nanoparticle formation during oxidation catalysis with NaIO4 as primary oxidant. Complexes bearing chelate ligands such as 2,2′-bipyridine, 2-phenylpyridine, or 2-(2′-pyridyl)-2-propanolate were found to be highly resistant toward particle formation, and oxidation catalysis with these compounds is thus believed to be molecular in nature under our conditions. Even with the less stable hydroxo/aqua complex [Cp*2Ir2(μ-OH)3]OH, nanoparticle formation strongly depended on the exact conditions and elapsed time. Test experiments on the isolated particles and comparison of UV–vis data with light scattering profiles revealed that the formation of a deep purple-blue color (580 nm) is not indicative of particle formation during oxidation catalysis with molecular iridium precursors as suggested previously.
Original languageEnglish
Pages (from-to)9785-9795
Number of pages11
JournalJournal of the American Chemical Society
Volume134
Issue number23
Early online date16 May 2012
DOIs
Publication statusPublished - 13 Jun 2012

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