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Título

Local structure of Iridium organometallic catalysts covalently bonded to carbon nanotubes

AutorBlasco, Javier; Cuartero, Vera; Subías, G.; Jiménez, M. Victoria ; Pérez-Torrente, Jesús J. ; Oro, Luis A. ; Blanco, Matías ; Álvarez Rodríguez, Patricia ; Blanco Rodríguez, Clara ; Menéndez López, Rosa María
Fecha de publicación2016
EditorInstitute of Physics (Great Britain)
CitaciónJournal of Physics - Conference Series 712(1): 012052 (2016)
ResumenHybrid catalysts based on Iridium N-heterocyclic carbenes anchored to carbon nanotubes (CNT) have been studied by XAFS spectroscopy. Oxidation of CNT yields a large amount of functional groups, mainly hydroxyl groups at the walls and carboxylic groups at the tips, defects and edges. Different kinds of esterification reactions were performed to functionalize oxidized CNT with imidazolium salts. Then, the resulting products were reacted with an Ir organometallic compound to form hybrid catalysts efficient in hydrogen transfer processes. XANES spectroscopy agree with the presence of Ir(I) in these catalysts and the EXAFS spectra detected differences in the local structure of Ir atoms between the initial Ir organometallic compound and the Ir complexes anchored to the CNT. Our results confirm that the halide atom, present in the Ir precursor, was replaced by oxygen from -OH groups at the CNT wall in the first coordination shell of Ir. The lability of this group accounts for the good recyclability and the good efficiency shown by these hybrid catalysts.
DescripciónTrabajo presentado como póster a la 16th International Conference on X-ray Absorption Fine Structure (XAFS16), celebrada en Karlsruhe (Germany) del 23 al 28 de agosto de 2015.
Versión del editorhttp://dx.doi.org/10.1088/1742-6596/712/1/012052
URIhttp://hdl.handle.net/10261/137428
DOI10.1088/1742-6596/712/1/012052
E-ISSN1742-6596
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