4.6 Article

Amphiphilic ionic liquid stabilizing palladium nanoparticles for highly efficient catalytic hydrogenation

Journal

PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 13, Issue 30, Pages 13492-13500

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c1cp20255c

Keywords

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Funding

  1. National Natural Science Foundation of China [20773037, 21073058]
  2. Higher Education of China, China [20100074110014]
  3. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission
  4. Ministry of Education, Hubei Province, South-Central University for Nationalities, P.R. China [CHCL08001]

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The highly water-soluble palladium nanoparticles (NPs) were synthesized by using the amphiphilic poly(ethylene glycol)-functionalized dicationic imidazolium-based ionic liquid (C(12)Im-PEG IL) as a stabilizing agent. The aqueous dispersed palladium NPs in the range of 1.9 +/- 0.3 nm were observed by transmission electron microscopy (TEM). The physicochemical properties of C(12)Im-PEG IL in aqueous phase have been characterized by electrical conductivity, surface tension and dynamic light scattering (DLS) measurements. It was demonstrated that the amphiphilic ionic liquid can form micelles above its critical micelle concentration (CMC) in aqueous solution and the micelles played a crucial role in stabilizing the palladium NPs and thus promoted catalytic hydrogenation. Furthermore, the dicationic ionic liquid can also act as a gemini surfactant and generated emulsion between hydrophobic substrates and the catalytic aqueous phase during the reaction. The aqueous dispersed palladium NPs showed efficient activity for the catalytic hydrogenation of various substrates under very mild conditions and the stabilizing Pd(0) nanoparticles (NPs) can be reused at least eight times with complete conservation of activity.

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