5 years ago

Soluble Platinum Nanoparticles Ligated by Long-Chain N-Heterocyclic Carbenes as Catalysts

Soluble Platinum Nanoparticles Ligated by Long-Chain N-Heterocyclic Carbenes as Catalysts
Frank Glorius, Israel Cano, Piet W. N. M. van Leeuwen, Angela M. López-Vinasco, Bruno Chaudret, Yannick Coppel, Lena Rakers, Karine Philippot, Luis M. Martínez-Prieto
Soluble platinum nanoparticles (Pt NPs) ligated by two different long-chain N-heterocyclic carbenes (LC-IPr and LC-IMe) were synthesized and fully characterized by TEM, high-resolution TEM, wide-angle X-ray scattering (WAXS), X-ray photoelectron spectroscopy (XPS), and solution NMR. The surface chemistry of these NPs (Pt@LC-IPr and Pt@LC-IMe) was investigated by FT-IR and solid state NMR using CO as a probe molecule. A clear influence of the bulkiness of the N-substituents on the size, surface state, and catalytic activity of these Pt NPs was observed. While Pt@LC-IMe showed no activity in the hydroboration of phenylacetylene, Pt@LC-IPr revealed good selectivity for the trans-isomer, which may be supported by a homogeneous species. This is the first example of hydroboration of acetylenes catalyzed by non-supported Pt NPs. Telling a tall tail: soluble platinum nanoparticles ligated by two different long-chain N-heterocyclic carbenes (Pt@LC-IPr and Pt@LC-IMe) show marked differences in their catalytic activity depending on the bulkiness of the N-substituents. While Pt@LC-IMe behaves similarly to heterogeneous catalysts, the catalytic activity of Pt@LC-IPr parallels that of molecular complexes in the hydroboration of phenylacetylene.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201702288

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