Characterization of a Poly-4-Vinylpyridine-Supported CuPd Bimetallic Catalyst for Sonogashira Coupling Reactions

Claudio Evangelisti; Antonella Balerna; Rinaldo Psaro; Graziano Fusini; Adriano Carpita; Maurizio Benfatto

doi:10.1002/cphc.201700215

Characterization of a Poly-4-Vinylpyridine-Supported CuPd Bimetallic Catalyst for Sonogashira Coupling Reactions

Chemphyschem. 2017 Jul 19;18(14):1921-1928. doi: 10.1002/cphc.201700215. Epub 2017 May 30.

Authors

Claudio Evangelisti¹, Antonella Balerna², Rinaldo Psaro¹, Graziano Fusini^{1

3}, Adriano Carpita³, Maurizio Benfatto²

Affiliations

¹ Institute of Molecular Science and Technologies, CNR, viaG. Fantoli 16/15, 20138, Milano, Italy.
² Frascati National Laboratories, INFN, Via E. Fermi 40, 00044, Frascati, Roma, Italy.
³ Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, 56124, Pisa, Italy.

PMID: 28449245
DOI: 10.1002/cphc.201700215

Abstract

CuPd bimetallic solvated metal atoms (SMA) synthesized by metal vapor synthesis (MVS) technique and supported on poly-4-vinylpyridine (PVPy) resin, showed significantly higher catalytic activity in Sonogashira-type carbon-carbon coupling reactions than the corresponding monometallic Cu and Pd systems as well as their physical mixture. The analysis of the bimetallic catalyst combining transmission electron microscopy techniques and X-ray absorption fine structure (XAFS) spectroscopy revealed the presence of small Pd nanoparticles (d_m =2.5 nm) while the analysis of the X-ray absorption data, at the Cu K-edge suggests the formation of thin and incomplete Cu oxide layers around the Pd-rich cores.

Keywords: Sonogashira reactions; XAFS spectroscopy; bimetallic CuPd catalyst; metal vapor synthesis; transmission electron microscopy.