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Issue 5, 2010
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On the structural and surface properties of transition-metal nanoparticles in ionic liquids

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Abstract

Ionic liquids (ILs), in particular imidazolium-based ILs, have proven to be suitable media for the generation and stabilisation of soluble metal nanoparticles (NPs). Indeed, transition-metal NPs with small sizes, narrow size distribution and different shapes have been prepared by reduction of organometallic compounds with molecular hydrogen, decomposition of transition-metal complexes in the zero-valent state, metal bombardment or simple transfer for previously prepared water- or classical organic solvent-soluble colloids to the ILs. The formation and stabilisation of NPs in these highly hydrogen bonded organised supramolecular fluids occur with the re-organisation of the hydrogen bond network and the generation of nanostructures with polar and non-polar regions, including the NPs. The IL forms a protective layer, which is probably composed of imidazolium aggregates located immediately adjacent to the nanoparticle surface, which provides both steric and electronic protection against aggregation and/or agglomeration. These stable transition-metal NPs immobilised in the ILs have proven to be efficient green catalysts for several reactions in multiphase conditions and also novel materials for chemical sensors. In this critical review, the structural/surface properties of these soluble metal NPs dispersed in ILs and their application in catalysis and as chemical sensors are discussed, with particular attention paid to the stabilisation models proposed to explain the stability and properties of these metal NPs (219 references).

Graphical abstract: On the structural and surface properties of transition-metal nanoparticles in ionic liquids

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Publication details

The article was received on 04 Nov 2009 and first published on 08 Feb 2010


Article type: Critical Review
DOI: 10.1039/B822551F
Citation: Chem. Soc. Rev., 2010,39, 1780-1804
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    On the structural and surface properties of transition-metal nanoparticles in ionic liquids

    J. Dupont and J. D. Scholten, Chem. Soc. Rev., 2010, 39, 1780
    DOI: 10.1039/B822551F

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