Non-covalent immobilization of RhDuphos on carbon nanotubes and carbon xerogels

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Title: Non-covalent immobilization of RhDuphos on carbon nanotubes and carbon xerogels
Authors: Gheorghiu, Constanta Cristina | Salinas Martínez de Lecea, Concepción | Román-Martínez, M. Carmen
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Hybrid catalysts | Rhodium chiral complex | Carbon xerogels | Carbon nanotubes | Hydrogenation
Knowledge Area: Química Inorgánica
Issue Date: 20-May-2014
Publisher: Elsevier
Citation: Applied Catalysis A: General. 2014, 478: 194-203. doi:10.1016/j.apcata.2014.04.001
Abstract: The immobilization of the chiral complex RhDuphos, by electrostatic or π–π (adsorption) interactions, on carbon nanotubes and carbon xerogels is investigated. To promote such interactions, the supports were either oxidized or heat treated to create carboxylic type surface groups or an apolar surface, respectively. The catalysts were tested in the hydrogenation of methyl 2-acetamidoacrylate. The prepared hybrid catalysts are less active than the homogeneous RhDuphos, but most of them show a high enantioselectivity and the one prepared with the oxidized carbon xerogel is also reusable, being able to give a high substrate conversion, keeping as well a high enantioselectivity. The anchorage by electrostatic interactions is more interesting than the anchorage by π–π interactions, as the π–π adsorption method produces a modification of the metal complex structure leading to an active hybrid catalyst but without enantioselectivity. The creation of carboxylic groups on the support surface has led to some hindering of the complex leaching.
Sponsor: The authors thank the financial support to MINECO, Project MAT2012-32832, to GVA and FEDER, Project PROMETEO 2009/047, and to MEC for the FPU scholarship of C.C.G.
ISSN: 0926-860X (Print) | 1873-3875 (Online)
DOI: 10.1016/j.apcata.2014.04.001
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2014 Elsevier B.V.
Peer Review: si
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