NHC-stabilized ruthenium nanoparticles as new catalysts for the hydrogenation of aromatics

González-Gálvez, David; Lara, Patricia; Rivada‐Wheelaghan, Orestes; Conejero, Salvador; Chaudret, Bruno; Philippot, Karine; Leeuwen, Piet W. N. M. van

doi:10.1039/c2cy20561k

Cited by 128 publications

(90 citation statements)

References 46 publications

(51 reference statements)

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“…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. [4][5][6][7][8][9][10][11][12][13] Some of us have characterized the coordination of such ligands to ruthenium nanoparticles by solid-state NMR spectroscopy. Solidstate NMR studies showed coordination of the carbene ligands to the nanoparticle surface and allowed the determination of a 13 C-195 Pt coupling constant for the first time in a nanosystem (940 Hz).…”

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confidence: 99%

“…[1] The agglomeration of MNPs can be avoided by coordinating ligands to their surface. [4][5][6][7][8][9][10][11][12][13] Some of us have characterized the coordination of such ligands to ruthenium nanoparticles by solid-state NMR spectroscopy. [3] Surprisingly, the stabilization of MNPs with NHC ligands and, more specifically, the interaction between the metal surface and the NHC ligand, have rarely been studied.…”

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confidence: 99%

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

Baquero¹,

Tricard²,

Flores³

et al. 2014

Angew Chem Int Ed

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119

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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 (13)C-(195)Pt 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.

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confidence: 99%

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confidence: 99%

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

Baquero¹,

Tricard²,

Flores³

et al. 2014

Angew Chem Int Ed

Self Cite

119

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“…36,38 Some NHC-based metal NPs have been applied in metal-catalyzed hydrogenation reactions (M = Ir, Ru, Pd, Pt). 26,32−34,37,39,43 The enhanced stability of NHC-based SAMs and NPs to oxidative treatments was reported very recently. 42,47 …”

Section: Introductionmentioning

confidence: 96%

N-Heterocyclic Carbene Ligands for Au Nanocrystal Stabilization and Three-Dimensional Self-Assembly

2016

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N-Heterocyclic carbenes (NHCs) have emerged as a new class of ligands for materials chemistry that appears particularly relevant for the stabilization and functionalization of metal nanoparticles (NPs). The particular properties and high synthetic flexibility of NHCs make them highly attractive tools for the development of new (nano)materials and the fundamental study of their properties. The relationships between the NHC structure and NP structure/properties, including physical, biological, and self-assembly properties, remain largely unknown. In the past decade, many efforts have been made to gain more fundamental understanding in this area. In this feature article, we present our contribution in this field focusing on the formation of NHC-coated Au nanocrystals (NCs), their stability, and their ability to self-assemble into 3D crystalline structures called supracrystals. First, the formation of NHC-stabilized Au NCs is discussed by comparing different NHC structures, NHC-based Au precursors, and synthesis methods. This study shows the major role of the NHC structure in obtaining both stable NHC-coated Au NCs and narrow size distributions. In a second part, a comparative study of the oxygen resistance of NHC- and thiol-coated NCs is presented, demonstrating the enhanced stability of NHC-coated Au NCs to oxygen-based treatments. Finally, the self-assembly of NHC-coated Au NCs into 3D Au superlattices is presented. The formation of large organized domains of several micrometers is described from the design of NHCs tailored with long alkyl chains. In these different contexts, efforts have been made to gain a more in-depth understanding of the behavior of NHC ligands at the surface of NCs. These results show that the NHC-based approach to nanomaterials has many assets for opening a new research area in the supracrystal world.

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“…39 Hybrid nanomaterials belong to an interesting class of nanomaterials owing to their fascinating properties that are different from their individual constituent(s). [45][46][47][48][49][50] However, there is no report regarding the synthesis of ruthenium nanodots by using carbon nanodots to the best of our knowledge. So, there is a real need to explore the possibility of newly synthesized carbon nanodots as a template for preparing other nanoparticles/nanodots.…”

Section: Introductionmentioning

confidence: 99%

Carbon nanodots, Ru nanodots and hybrid nanodots: preparation and catalytic properties

2015

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New hybrid nanodots comprised of carbon nanodots and ruthenium nanodots have been synthesized from peptide functionalized carbon nanodots and a ruthenium salt. At first, carbon nanodots have been prepared by carbonization of a synthetic tripeptide and citric acid. Then these functionalized carbon nanodots act as a template to form ruthenium nanodots from a ruthenium salt in the presence of a reducing agent, sodium borohydride in water medium. These functionalized carbon nanodots exhibit a blue emission with a high quantum yield (69.8%). Various techniques including UV-Vis, fluorescence, FTIR, X-ray photoelectron spectroscopy (XPS), Raman and X-ray diffraction and transmission electron microscopy (TEM) analyses have been used to characterize carbon nanodots and hybrid nanodots. This is a new example of preparing ruthenium nanodots by using peptide functionalized carbon nanodots as a stabilizer to form unique hybrid nanodots consisting of carbon nanodots and ruthenium nanodots in water medium.Moreover, hybrid nanodots act as a potential catalyst for the reduction of organic azides to their corresponding amines in aqueous medium. A variety of functionalized organic azides have been reduced to their corresponding amines with high yields without affecting other functionalities indicating the good chemoselectivity of the catalyst towards the azide functionality.Scheme 1 Schematic representation of the formation of carbon nanodots by carbonization of Gly-Gly-DNDn. J. Mater. Chem. AThis journal is

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NHC-stabilized ruthenium nanoparticles as new catalysts for the hydrogenation of aromatics

Cited by 128 publications

References 46 publications

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

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

N-Heterocyclic Carbene Ligands for Au Nanocrystal Stabilization and Three-Dimensional Self-Assembly

Carbon nanodots, Ru nanodots and hybrid nanodots: preparation and catalytic properties

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