Particle formation during oxidation catalysis with Cp* iridium complexes

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

Research output: Contribution to journalArticle

113 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

Fingerprint

Iridium
Catalysis
Light scattering
Oxidation
Nanoparticles
Bearings (structural)
2,2'-Dipyridyl
Ultraviolet Rays
Oxidants
Color
Ligands
Light
Monitoring
Experiments

Cite this

Particle formation during oxidation catalysis with Cp* iridium complexes. / Hintermair, Ulrich; Hashmi, Sara M.; Elimelech, Menachem; Crabtree, Robert H.

In: Journal of the American Chemical Society, Vol. 134, No. 23, 13.06.2012, p. 9785-9795.

Research output: Contribution to journalArticle

Hintermair, Ulrich ; Hashmi, Sara M. ; Elimelech, Menachem ; Crabtree, Robert H. / Particle formation during oxidation catalysis with Cp* iridium complexes. In: Journal of the American Chemical Society. 2012 ; Vol. 134, No. 23. pp. 9785-9795.
@article{f5e0572676b546cb8beebdd173f510a7,
title = "Particle formation during oxidation catalysis with Cp* iridium complexes",
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.",
author = "Ulrich Hintermair and Hashmi, {Sara M.} and Menachem Elimelech and Crabtree, {Robert H.}",
year = "2012",
month = "6",
day = "13",
doi = "10.1021/ja3033026",
language = "English",
volume = "134",
pages = "9785--9795",
journal = "Journal of the American Chemical Society",
issn = "0002-7863",
publisher = "American Chemical Society",
number = "23",

}

TY - JOUR

T1 - Particle formation during oxidation catalysis with Cp* iridium complexes

AU - Hintermair, Ulrich

AU - Hashmi, Sara M.

AU - Elimelech, Menachem

AU - Crabtree, Robert H.

PY - 2012/6/13

Y1 - 2012/6/13

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84862207487&partnerID=8YFLogxK

UR - http://dx.doi.org/10.1021/ja3033026

U2 - 10.1021/ja3033026

DO - 10.1021/ja3033026

M3 - Article

VL - 134

SP - 9785

EP - 9795

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

SN - 0002-7863

IS - 23

ER -