64421 20231127095530.0 doi 10.1088/1742-6596/712/1/012052 sideral 103710 ART-2016-103710 eng Blasco, Javier Universidad de Zaragoza (orcid)0000-0002-9706-3272 Local structure of Iridium organometallic catalysts covalently bonded to carbon nanotubes 2016 Access copy available to the general public Unrestricted Hybrid 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. info:eu-repo/grantAgreement/ES/DGA/E07 info:eu-repo/grantAgreement/ES/DGA/E69 info:eu-repo/grantAgreement/ES/MINECO-FEDER/CTQ2010-15221 info:eu-repo/grantAgreement/ES/MINECO/MAT2012-38213-C02-01 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 0.24 2016 Physics and Astronomy (miscellaneous) 2016 Q3 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Cuartero, Vera (orcid)0000-0002-8021-8709 Subías, Gloria Universidad de Zaragoza (orcid)0000-0002-9029-1977 Jiménez, M. Victoria Universidad de Zaragoza (orcid)0000-0002-0545-9107 Pérez-Torrente, Jesús J. Universidad de Zaragoza (orcid)0000-0002-3327-0918 Oro, Luis A. Universidad de Zaragoza (orcid)0000-0001-7154-7239 Blanco, Matías Älvarez, Patricia Blanco, Clara Menéndez, rosa 2010 760 Universidad de Zaragoza Dpto. Química Inorgánica Área Química Inorgánica 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 712, 012052 (2016), [5 pp.] J. Phys.: Conf. Ser. Journal of Physics: Conference Series 1742-6588 334906 http://zaguan.unizar.es/record/64421/files/texto_completo.pdf Versión publicada 100049 http://zaguan.unizar.es/record/64421/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:64421 articulos driver 2023-11-27-09:46:24 ARTICLE