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Hydrogenation Processes at the Surface of Ruthenium Nanoparticles: A NMR Study

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Abstract

The reactivity of ruthenium nanoparticles stabilized by 4-(3-phenylpropyl)pyridine in hydrogen transfer and hydrogenation processes was monitored by NMR spectroscopy. Unsaturated substrates such as styrene, 4-vinylpyridine and 4-phenyl-but-3-en-2-one were used as model molecules to investigate the surface properties of nanoparticles by a combination of NMR studies. Interestingly, the hydrides present at the metallic surface after nanoparticles synthesis are selectively transferred to vinylic groups without reducing the aromatic rings, under dihydrogen-free atmosphere. DOSY and NOE NMR experiments permitted to propose a way of interaction of the organic compounds at the metallic surface. In particular, the coordination of the substrate could be evidenced for 4-vinylpyridine and 4-ethylpyridine but not for styrene derivatives.

Graphical Abstract

Curved double arrows represent magnetization exchanges. Straight arrows represent adsorption/desorption phenomena.

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Notes

  1. The regime change from a small to a big molecule is related to the frequency of the spectrometer (ω) and the mobility of the molecules (Tc, the rotation time of the molecule). For ωTc = 1.1, zero intensity for NOE effects; for ωTc < 1.1, positive NOE signals; for ωTc > 1.1, negative NOE signals. Using a 500 MHz spectrometer, molecules with mass lower than 600 g/mol give positive NOE signals.

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Acknowledgments

This work was financially supported by the Centre National de la Recherche Scientifique (CNRS), the Université Paul Sabatier and the Institut de Chimie de Toulouse. I.F. and P.L. are grateful to the Université Paul Sabatier for a funded project (AO1 2012).

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Authors and Affiliations

  1. Laboratoire Hétérochimie Fondamentale et Appliquée, UMR CNRS 5069, Université Paul Sabatier, 118 Route de Narbonne, 31062, Toulouse Cedex 9, France

    I. Favier, E. Teuma & M. Gómez

  2. Service Commun RMN, ICT, Université Paul Sabatier, 118 Route de Narbonne, 31062, Toulouse Cedex 9, France

    P. Lavedan

  3. Laboratoire d’Ingénierie des Systèmes—Bioprocédés, UMR 5504 INSA, CNRS, UMR 792 INSA, INRA, 135 Avenue de Rangueil, 31077, Toulouse Cedex 04, France

    S. Massou

  4. LCC (Laboratoire de Chimie de Coordination), CNRS, 205 Route de Narbonne, 31077, Toulouse, France

    K. Philippot

  5. LCC, INPT, UPS, Université de Toulouse, 31077, Toulouse, France

    K. Philippot

  6. Laboratoire de Physique Et Chimie de Nano-Objets (LPCNO), 135 Avenue de Rangueil, 31077, Toulouse, France

    B. Chaudret

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  1. I. Favier
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  2. P. Lavedan
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  4. E. Teuma
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  7. M. Gómez
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Corresponding author

Correspondence to M. Gómez.

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Favier, I., Lavedan, P., Massou, S. et al. Hydrogenation Processes at the Surface of Ruthenium Nanoparticles: A NMR Study. Top Catal 56, 1253–1261 (2013). https://doi.org/10.1007/s11244-013-0092-4

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