Jump to main content
Jump to site search

Dissimilar Catalytic Behavior of Molecular or Colloidal Palladium Systems with a New NHC Ligand


In this work, we describe the synthesis of a new N-heterocyclic carbene (NHC) ligand, derived from a hybrid pyrazole-imidazolium scaffold, namely 1-[2-(3,5-dimethylpyrazol-1-yl)ethyl]-3-((S)-1-phenylethyl)-3H-imidazol-2-ylidene (L). This ligand has been used as a stabilizer for the organometallic synthesis of palladium(0) nanoparticles (Pd NPs). L presents a better stabilizing effect than the pre-carbenic HLCl counterpart, allowing the formation of isolated Pd NPs while HLCl yields aggregated ones. Additionally, molecular Pd(II) coordination compounds of L and HLCl were synthesized and characterized to better understand the coordination modes of these ligands. Both molecular and colloidal Pd systems have been further tested in catalytic C-C coupling processes. Three different types of reactions have been observed depending on the catalytic system: i) the Suzuki-Miyaura reaction takes place with Pd molecular complexes; ii) a secondary reaction, the dehalogenation of the substrate, is always detected and iii) the C-C homocoupling between two molecules of bromoarenes is observed with colloidal catalysts.

Back to tab navigation

Supplementary files

Publication details

The article was received on 26 Jul 2017, accepted on 07 Aug 2017 and first published on 08 Aug 2017

Article type: Paper
DOI: 10.1039/C7DT02729J
Citation: Dalton Trans., 2017, Accepted Manuscript
  •   Request permissions

    Dissimilar Catalytic Behavior of Molecular or Colloidal Palladium Systems with a New NHC Ligand

    F. Gómez-Villarraga, J. De Tovar, M. Guerrero, P. Nolis, T. Parella, P. Lecante, N. Romero, L. Escriche, R. Bofill, J. Ros, X. SALA, K. Philippot and J. García-Antón, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT02729J

Search articles by author