Surface Organometallic Chemistry of Supported Iridium(III) as a Probe for Organotransition Metal–Support Interactions in C–H Activation

Kaphan, David M.; Klet, Rachel C.; Perras, Frederic A.; Pruski, Marek; Yang, Ce; Kropf, A. Jeremy; Delferro, Massimiliano

doi:10.1021/acscatal.8b00855

Surface Organometallic Chemistry of Supported Iridium(III) as a Probe for Organotransition Metal–Support Interactions in C–H Activation

Journal Article · Fri May 11 00:00:00 EDT 2018 · ACS Catalysis

DOI:https://doi.org/10.1021/acscatal.8b00855· OSTI ID:1440975

Kaphan, David M. ^[1]; ^[1]; Perras, Frederic A. ^[2]; ^[3]; Yang, Ce ^[1]; Kropf, A. Jeremy ^[1]; ^[1]

Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division
Ames Lab., Ames, IA (United States)
Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Chemistry

Systematic study of the interactions between organometallic catalysts and metal oxide support materials is essential for the realization of rational design in heterogeneous catalysis. Herein we describe the stoichiometric and catalytic chemistry of a [Cp*(PMe₃)Ir(III)] complex chemisorbed on a variety of acidic metal oxides as a multifaceted probe for stereoelectronic communication between the support and organometallic center. Electrophilic bond activation was explored in the context of stoichiometric hydrogenolysis as well as catalytic H/D exchange. Further information was obtained from the observation of processes related to dynamic exchange between grafted organometallic species and those in solution. The supported organometallic species were characterized by a variety of spectroscopic techniques including dynamic nuclear polarization-enhanced solid-state NMR spectroscopy, diffuse reflectance infrared Fourier transform spectroscopy, and X-ray absorption spectroscopy. Finally, strongly acidic modified metal oxides such as sulfated zirconia engender high levels of activity toward electrophilic bond activation of both sp² and sp³ C–H bonds, including the rapid deuteration of methane at room temperature; however, the global trend for the supports studied here does not suggest a direct correlation between activity and surface Brønsted acidity.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

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

Grant/Contract Number:: AC02-06CH11357; AC02-07CH11358

OSTI ID:: 1440975

Alternate ID(s):: OSTI ID: 1461450

Report Number(s):: IS-J--9599

Journal Information:: ACS Catalysis, Journal Name: ACS Catalysis Journal Issue: 6 Vol. 8; ISSN 2155-5435

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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