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Title

Enhanced hydrogen-transfer catalytic activity of iridium N-heterocyclic carbenes by covalent attachment on carbon nanotubes

AuthorsBlanco, Matías ; Álvarez Rodríguez, Patricia ; Blanco Rodríguez, Clara ; Jiménez, M. Victoria ; Fernández-Tornos, Javier ; Pérez-Torrente, Jesús J. ; Oro, Luis A. ; Menéndez López, Rosa María
Issue Date2013
PublisherAmerican Chemical Society
CitationACS Catalysis 3(6): 1307-1317 (2013)
AbstractOxidized multiwall carbon nanotubes (CNT) were covalently modified with appropriate hydroxyl-ending imidazolium salts using their carboxylic acid groups. Characterization of the imidazolium-modified samples through typical solid characterization techniques, such as TGA or XPS, allows for the determination of 16 wt % in CNT-1 and 31 wt % in CNT-2 as the amount of the imidazolic fragments in the carbon nanotubes. The imidazolium-functionalized materials were used to prepare nanohybrid materials containing iridium N-heterocyclic carbene (NHC)-type organometallic complexes with efficiencies as high as 95%. The nanotube-supported iridium-NHC materials were active in the heterogeneous iridium-catalyzed hydrogen-transfer reduction of cyclohexanone to cyclohexanol with 2-propanol/KOH as hydrogen source. The iridium hybrid materials are more efficient than related homogeneous catalysts based on acetoxy-functionalized Ir-NHC complexes with initial TOFs up to 5550 h -1. A good recyclability of the catalysts, without any loss of activity, and stability in air was observed. © 2013 American Chemical Society.
Publisher version (URL)http://dx.doi.org/10.1021/cs4000798
URIhttp://hdl.handle.net/10261/111183
DOIhttp://dx.doi.org/10.1021/cs4000798
Identifiersdoi: 10.1021/cs4000798
e-issn: 2155-5435
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