Issue 3, 2016

A versatile method for the preparation of carbon–rhodium hybrid catalysts on graphene and carbon black

Abstract

Strategies for combining the selectivity and efficiency of homogeneous organometallic catalysts with the versatility of heterogeneous catalysts are urgently needed. Herein a direct and modular methodology is presented that provides rapid access to well-defined carbon–rhodium hybrid catalysts. A pre-synthesized Rh(I) complex containing a carbene-triazole ligand was found to be stable for direct immobilization onto unactivated graphene, carbon black and glassy carbon electrodes. Characterization of the heterogeneous systems using X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), inductively coupled plasma-optical emission spectroscopy/mass spectrometry (ICP-OES/MS), Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) confirmed the well-defined nature of the hybrid catalysts. The hybrid catalysts show excellent activity, comparable to that of the homogeneous system for the hydrosilylation of diphenylacetylene, with turnover numbers ranging from 5000 to 48 000. These catalysts are the best reported to date for the hydrosilylation of diphenylacetylene. In common with conventional heterogeneous catalysts, high reusability, due to a lack of Rh metal leaching, was also observed for all carbon–rhodium complexes under investigation.

Graphical abstract: A versatile method for the preparation of carbon–rhodium hybrid catalysts on graphene and carbon black

Supplementary files

Article information

Article type
Edge Article
Submitted
06 Oct 2015
Accepted
07 Dec 2015
First published
08 Dec 2015
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2016,7, 1996-2004

Author version available

A versatile method for the preparation of carbon–rhodium hybrid catalysts on graphene and carbon black

C. M. Wong, D. B. Walker, A. H. Soeriyadi, J. J. Gooding and B. A. Messerle, Chem. Sci., 2016, 7, 1996 DOI: 10.1039/C5SC03787E

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