Ligand tethering by ion-exchange for the immobilization of homogeneous catalysts

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Title: Ligand tethering by ion-exchange for the immobilization of homogeneous catalysts
Authors: Such-Basañez, Ion | 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
Keywords: Immobilization | Ion-exchange | Hybrid catalysts | Al-MCM-41 | Rh complex
Knowledge Area: Química Inorgánica
Issue Date: Aug-2012
Publisher: Bentham Science Publishers BSP
Citation: SUCH-BASÁÑEZ, I.; SALINAS-MARTÍNEZ DE LECEA, C.; ROMÁN-MARTÍNEZ, M.C. “Ligand tethering by ion-exchange for the immobilization of homogeneous catalysts”. Current Catalysis. Issue 2 (2012). ISSN 2211-5455, pp. 100-160
Abstract: A Rh phosphine complex, derived from the Wilkinson’s catalyst, has been immobilized by ion-exchange on the ammonium form of a Al-MCM-41 sample. Ammonium ions have been exchanged by cholamine ions, which act as an amine ligand, and then the Wilkinson’s catalyst has been immobilized by substitution of a phosphine ligand by the anchored amine. This is a novel immobilization procedure, as a ligand, instead of the whole complex, is tethered to the support by ion exchange. The obtained hybrid catalyst has been characterized by Elemental Analysis, DRIFTS and XPS. The quantitative exchange of ammonium by cholamine and coordination of Rh to amines has been observed. Most of the anchored Rh is considered to be coordinated to the ligand tethered to the support and a small proportion seems to be interacting with the protonated ligand or with the support surface. The catalyst has been tested in the hydrogenation of cyclohexene and in the hydroformylation of 1-octene. In the first case the catalyst is active and reusable, while a strong Rh leaching takes place in the second one.
Sponsor: The authors thank the Spanish MICINN (project MAT2009-07150) and Generalitat Valenciana (PROMETEO/2009/047) and FEDER for financial support. I. Such thanks Ministerio de Educación y Ciencia for a FPU grant.
ISSN: 2211-5455 (Online) | 2211-5447 (Print)
DOI: 10.2174/2211544711201020100
Language: eng
Type: info:eu-repo/semantics/article
Rights: La versión online se encuentra en Open Access Plus
Peer Review: si
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Appears in Collections:INV - MCMA - Artículos de Revistas

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