Stabilized Noble Metal Nanoparticles: An Unavoidable Family of Catalysts for Arene Derivative Hydrogenation

Roucoux, Alain

doi:10.1007/b138080

Cited by 47 publications

(23 citation statements)

References 61 publications

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“…Figure 2 shows particle size distribution and TEM micrographs and of Rh samples. As expected, these observations connected stabilizing properties of the (S,S)-DIPAMP ligand with the control of the agglomeration of supported nanoparticles, making this procedure a useful, easy and reproducible method of preparing materials for catalytic purposes 1,13,15 . Specific surface area and pore volume determined from N 2 adsorptiondesorption isotherms are displayed in Table 2.…”

Section: Catalysts Characterizationsupporting

confidence: 73%

“…Metal agglomeration is an undesired process, mainly in catalytic reactions, because it leads to loss some properties associated with the "nano state". Chiral stabilizer agents control metal growing generating high amount of metal particles on the asymmetry surface [6][7][8][9][10][11][12][13] . One of the strategies to take advantage of the abilities of the stabilizer agents and use them for catalytic applications is the deposition of chiral nanostructured metal colloids on catalyst supports such as SiO 2 and other mesoporous materials.…”

Section: Introductionmentioning

confidence: 99%

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CHIRAL Rh/SiO2 CATALYSTS FOR ENANTIOSELECTIVE HYDROGENATION REACTIONS: THE ROLE OF (S,S)-DIPAMP AS CHIRAL MODIFIER AND STABILIZER ON METALLIC NANOPARTICLES SYNTHESIS

Mella¹,

Ávila²,

SANCHEZ³

et al. 2013

J. Chil. Chem. Soc.

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Rhodium nanoparticles were successfully stabilized by the (S,S)-1,2-ethanediylbis [(2-ethoxyphenyl)phenylphosphine] ((S,S)-DIPAMP) deposited on SiO 2 prepared by a facile reduction and impregnation method. The chiral catalysts obtained were efficient for the enantioselective hydrogenation reactions of prochiral compounds. The catalysts synthesized from [Rh(μ-OMe)(COD)] 2 in the presence of different amounts of a ligand used as chiral stabilizer, showed good metal dispersion. As shown by TEM, the metal particle size ranged between 1 and 2 nm using stabilizer and 9.1 nm was achieved without chiral ligand. Other techniques were used to characterize the chiral catalysts such as X-ray diffraction (XRD), electron diffraction, thermogravimetric analysis (TGA) and N 2 adsorption-desorption isotherms.(S,S)-DIPAMP was used as the stabilizer of metal particles to prevent growing and agglomeration, and it also acts as chiral modifier inducing enantioselectivity in the asymmetric hydrogenation of 3,4-hexanodione (HD), ethyl pyruvate (EP), ketopantolactone (KP), and acetophenone (AP). Under specific conditions such as 25 °C, 40 bar of H 2 and substrate/Rh=100, 1%Rh-(S,S)-DIPAMP/SiO 2 chiral catalysts showed excellent catalytic performance with conversion and enantiomeric excess (ee) levels up to 99% and 54% respectively.

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Section: Catalysts Characterizationsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

CHIRAL Rh/SiO2 CATALYSTS FOR ENANTIOSELECTIVE HYDROGENATION REACTIONS: THE ROLE OF (S,S)-DIPAMP AS CHIRAL MODIFIER AND STABILIZER ON METALLIC NANOPARTICLES SYNTHESIS

Mella¹,

Ávila²,

SANCHEZ³

et al. 2013

J. Chil. Chem. Soc.

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show abstract

“…[17] Finally, it seems that 2,2'-bipyridine has no real and significant influence on the particle size and structural organization. Figure 1 shows the mono-modal size distribution of 2,2'-Bipy- 6 ]. For a standard ratio [2,2'-Bipy]/Rh of 0.5, very stable suspensions are obtained without any agglomeration during several months.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, soluble noble metal nanoparticles are considered as an indispensable family of catalysts at the border between homogeneous and heterogeneous chemistry. [6] These metal nanocatalysts can be synthesized by various methods according to the "organic" or "aqueous" nature of the media, the nature of the precursor and, finally, the type of the used stabilizers. [7,8] Therefore, various protecting agents, such as polymers, surfactants, ligands, cyclodextrins but also dendrimers and ionic liquids, have been used.…”

Section: Introductionmentioning

confidence: 99%