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Title: Single-Site Zeolite-Anchored Organoiridium Carbonyl Complexes: Characterization of Structure and Reactivity by Spectroscopy and Computational Chemistry

Abstract

We formed a family of HY zeolite-supported cationic organoiridium carbonyl complexes by reaction of Ir(CO)2(acac) (acac=acetylacetonate) to form supported Ir(CO)2 complexes, which were treated at 298K and 1atm with flowing gas-phase reactants, including C2H4, H2, 12CO, 13CO, and D2O. Mass spectrometry was used to identify effluent gases, and infrared and X-ray absorption spectroscopies were used to characterize the supported species, with the results bolstered by DFT calculations. The support is crystalline and presents a nearly uniform array of bonding sites for the iridium species, so these were characterized by a high degree of uniformity, which allowed a precise determination of the species involved in the replacement, for example, of one CO ligand of each Ir(CO)2 complex with ethylene. The supported species include the following: Ir(CO)2, Ir(CO)(C2H4)2, Ir(CO)(C2H4), Ir(CO)(C2H5), and (tentatively) Ir(CO)(H). The data determine a reaction network involving all of these species.

Authors:
 [1];  [2];  [3];  [1]
  1. Univ. of California, Davis, CA (United States). Dept. of Chemical Engineering and Materials Science
  2. Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Chemistry; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). National Center for Computational Sciences
  3. Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Chemistry
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1261461
Grant/Contract Number:  
AC05-00OR22725; FG02-04ER15513; SC0005822; AC02-06CH11357; NA0001974; FG02-99ER45775
Resource Type:
Accepted Manuscript
Journal Name:
Chemistry - A European Journal
Additional Journal Information:
Journal Volume: 21; Journal Issue: 33; Journal ID: ISSN 0947-6539
Publisher:
ChemPubSoc Europe
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; CO probe molecule; DFT calculations; iridium carbonyls; iridium hydride; zeolites; relativistic effective potentials; dealuminated y-zeolite; spin-orbit operators; iridium complexes; CO; catalysts; clusters; supports; density; hydrogenation

Citation Formats

Martinez-Macias, Claudia, Chen, Mingyang, Dixon, David A., and Gates, Bruce C. Single-Site Zeolite-Anchored Organoiridium Carbonyl Complexes: Characterization of Structure and Reactivity by Spectroscopy and Computational Chemistry. United States: N. p., 2015. Web. doi:10.1002/chem.201501277.
Martinez-Macias, Claudia, Chen, Mingyang, Dixon, David A., & Gates, Bruce C. Single-Site Zeolite-Anchored Organoiridium Carbonyl Complexes: Characterization of Structure and Reactivity by Spectroscopy and Computational Chemistry. United States. doi:10.1002/chem.201501277.
Martinez-Macias, Claudia, Chen, Mingyang, Dixon, David A., and Gates, Bruce C. Fri . "Single-Site Zeolite-Anchored Organoiridium Carbonyl Complexes: Characterization of Structure and Reactivity by Spectroscopy and Computational Chemistry". United States. doi:10.1002/chem.201501277. https://www.osti.gov/servlets/purl/1261461.
@article{osti_1261461,
title = {Single-Site Zeolite-Anchored Organoiridium Carbonyl Complexes: Characterization of Structure and Reactivity by Spectroscopy and Computational Chemistry},
author = {Martinez-Macias, Claudia and Chen, Mingyang and Dixon, David A. and Gates, Bruce C.},
abstractNote = {We formed a family of HY zeolite-supported cationic organoiridium carbonyl complexes by reaction of Ir(CO)2(acac) (acac=acetylacetonate) to form supported Ir(CO)2 complexes, which were treated at 298K and 1atm with flowing gas-phase reactants, including C2H4, H2, 12CO, 13CO, and D2O. Mass spectrometry was used to identify effluent gases, and infrared and X-ray absorption spectroscopies were used to characterize the supported species, with the results bolstered by DFT calculations. The support is crystalline and presents a nearly uniform array of bonding sites for the iridium species, so these were characterized by a high degree of uniformity, which allowed a precise determination of the species involved in the replacement, for example, of one CO ligand of each Ir(CO)2 complex with ethylene. The supported species include the following: Ir(CO)2, Ir(CO)(C2H4)2, Ir(CO)(C2H4), Ir(CO)(C2H5), and (tentatively) Ir(CO)(H). The data determine a reaction network involving all of these species.},
doi = {10.1002/chem.201501277},
journal = {Chemistry - A European Journal},
number = 33,
volume = 21,
place = {United States},
year = {2015},
month = {7}
}

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Cited by: 11 works
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