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Novel catalysts: metal complexes immobilized into Bingel
functionalized carbon nanotubes
M. Ribeiro 1 , S. L. H. Rebelo 1 , A. Guedes, 2 M. F. R. Pereira 3 , J. L. Figueiredo 3 and C.
Freire 1
1 REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto,
4169-007 Porto.
2 Centro de Geologia e Departamento de Geociências, Ambiente e Ordenamento do Território,
Faculdade de Ciências, Universidade do Porto, 4169-007 Porto.
3 Laboratório de Catálise e Materiais (LCM), Laboratório Associado LSRE/LCM, Dep. Engenharia
Química, Fac. Engenharia, Univ. Porto, 4200-465 Porto.
The use of carbon nanotubes (CNTs) as catalysts and catalyst supports is a current research
area with excellent results. Such materials offer some advantages over conventional supports
due to their electronic properties and nanosized dimensions that will enhance adsorption and
thus chemical reactivity [1]. In this work, the functionalization of multi-walled carbon
nanotubes (MWCNTs) by the Bingel reaction is described, using malonate derivates in the
presence of a base such as DBU [2]. The MWCNTs formed in the Bingel reaction were further
reacted with cysteamine hydrochloride (Scheme 1).
Scheme 1
In order to prepare efficient heterogeneous catalysts, the material MWCNTs-SH was reacted
with complex (I) in the presence of a radical initiator (AIBN) for formation of a thioether
linkage, and with complexes (II) and (III) for axial coordination in the presence of a base.
Characterization of ligands and corresponding metal complexes was performed by NMR and
mass spectrometry, respectively. Carbon materials and heterogeneous catalysts were
characterized by XPS, FTIR and Raman.
References:
[1] Pereira, M. F. R., Figueiredo, J. L., Órfão J. J. M., Serp, P., Kalck, P. and Kihn, Y., (2004),
Catalytic activity of carbon nanotubes in the oxidative dehydrogenatoin of ethylbenzene, Carbon, 42,
2807-2813.
[2] Coleman, K. S., Bailey, S. R, Fogden, S., Green, M. L. H., (2003), Functionalization of singlewalled
carbon nanotubes via Bingel reaction, J. Am. Chem. Soc., 125, 8722-8723.
368 3 rd meeting of young researchers at UP