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Issue 30, 2011
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Ruthenium nanoparticles in ionic liquids: structural and stability effects of polar solutes

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Abstract

Ionic liquids are a stabilizing medium for the in situ synthesis of ruthenium nanoparticles. Herein we show that the addition of molecular polar solutes to the ionic liquid, even in low concentrations, eliminates the role of the ionic liquid 3D structure in controlling the size of ruthenium nanoparticles, and can induce their aggregation. We have performed the synthesis of ruthenium nanoparticles by decomposition of [Ru(COD)(COT)] in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [C1C4Im][NTf2], under H2 in the presence of varying amounts of water or 1-octylamine. For water added during the synthesis of metallic nanoparticles, a decrease of the solubility in the ionic liquid was observed, showed by nanoparticles located at the interface between aqueous and ionic phases. When 1-octylamine is present during the synthesis, stable nanoparticles of a constant size are obtained. When 1-octylamine is added after the synthesis, aggregation of the ruthenium nanoparticles is observed. In order to explain these phenomena, we have explored the molecular interactions between the different species using 13C-NMR and DOSY (Diffusional Order Spectroscopy) experiments, mixing calorimetry, surface tension measurements and molecular simulations. We conclude that the behaviour of the ruthenium nanoparticles in [C1C4Im][NTf2] in the presence of 1-octylamine depends on the interaction between the ligand and the nanoparticles in terms of the energetics but also of the structural arrangement of the amine at the nanoparticle's surface.

Graphical abstract: Ruthenium nanoparticles in ionic liquids: structural and stability effects of polar solutes

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Publication details

The article was received on 04 Mar 2011, accepted on 28 Apr 2011 and first published on 20 May 2011


Article type: Paper
DOI: 10.1039/C1CP20623K
Citation: Phys. Chem. Chem. Phys., 2011,13, 13527-13536
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    Ruthenium nanoparticles in ionic liquids: structural and stability effects of polar solutes

    G. Salas, A. Podgoršek, P. S. Campbell, C. C. Santini, A. A. H. Pádua, M. F. Costa Gomes, K. Philippot, B. Chaudret and M. Turmine, Phys. Chem. Chem. Phys., 2011, 13, 13527
    DOI: 10.1039/C1CP20623K

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