Synthesis of superparamagnetic carbon nanotubes immobilized Pt and Pd pincer complexes: highly active and selective catalysts towards cyclohexane oxidation with dioxygen

resumo

Single-walled carbon nanotubes (SWNTs) with Ni/Co have been prepared using an arc discharge technique and Ni/Co-carbon composite rods in an inert atmosphere and were surface modified using 3-aminophenyl trimethoxysilane. These NH2-functionalized magnetic carbon nanotubes have been used as a novel support for Pd-(II) and Pt-(II) pincer complexes immobilized as magnetic nano-catalysts. The morphology of the support and the catalysts have been characterized by IR, EPR, SEM, TGA, TEM, XRD, AAS and EDS analysis. These magnetic nano-catalysts have been tested on the industrially important cyclohexane (Cy-hx) oxidation with O-2 and significantly high TONs of 1678 to 1946 were achieved under solvent free and relatively mild conditions. The SWNTs/Pd catalyst provided the best conversion, 22.7%, but the SWNTs/Pt system also provided a good conversion of 20.7%.

palavras-chave

MODIFIED SILICA-GEL; MOLECULAR-OXYGEN; SCHIFF-BASE; MAGNETIC NANOPARTICLES; DRUG-DELIVERY; FUNCTIONALIZATION; THIOAMIDE; ALKANES

categoria

Chemistry

autores

Machado, K; Mishra, J; Suzuki, S; Mishra, GS

nossos autores

Grupos

agradecimentos

We are grateful to Foundacao para a Ciencia e a Tecnologia (FCT), Portugal for financial support under project: PTDC/EQU-ERQ/110825/2009. We also thank Prof. S. Mukhopadhyay, Chem. Dept., IIT, Indore, India for valuable discussion under

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