Highly Stable Water-Soluble Platinum Nanoparticles Stabilized by Hydrophilic N-Heterocyclic Carbenes

Edwin A Baquero (1) , Simon Tricard (2) , Juan Carlos Flores (1) , Ernesto De jesús (1) , Bruno Chaudret (2)

1 Departamento Química Orgánica y Química Inorgánica, Universidad de Alcalá, Alcalá de Henares,
2 LPCNO - Laboratoire de physique et chimie des nano-objets

Controlling the synthesis of stable metal nanoparticles in water is a current challenge in nanochemistry. The strategy presented herein uses sulfonated N‐heterocyclic carbene (NHC) ligands to stabilize platinum nanoparticles (PtNPs) in water, under air, for an indefinite time period. The particles were prepared by thermal decomposition of a preformed molecular Pt complex containing the NHC ligand and were then purified by dialysis and characterized by TEM, high‐resolution TEM, and spectroscopic techniques. Solid‐state NMR studies showed coordination of the carbene ligands to the nanoparticle surface and allowed the determination of a 13C–195Pt coupling constant for the first time in a nanosystem (940 Hz). Additionally, in one case a novel structure was formed in which platinum(II) NHC complexes form a second coordination sphere around the nanoparticle.

Mots clés: N‐heterocyclic carbenes; nanoparticles; platinum; solid‐state NMR spectroscopy; surface characterization

Domaines: Chimie

Edwin A Baquero, Simon Tricard, Juan Carlos Flores, Ernesto De jesús, Bruno Chaudret. Highly Stable Water-Soluble Platinum Nanoparticles Stabilized by Hydrophilic N-Heterocyclic Carbenes. Angewandte Chemie International Edition, 2014, 53 (48), pp.13220-13224. ⟨hal-02023113⟩