Nanoscale colloidal metals and alloys stabilized by solvents and surfactants Preparation and use as catalyst precursors

Bönnemann, Helmut; Braun, Gerd; Brijoux, W.; Brinkmann, Rainer; Tilling, Andreas Schulze; Seevogel, Klaus; Siepen, K.

doi:10.1016/0022-328x(96)06273-0

Cited by 347 publications

(237 citation statements)

References 86 publications

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“…A transition from the bulk band structure to individual localized energy levels occurs in clusters of subnanometer to nanometer size, and the detection of quantum size effects has been of great interest to scientists and technologists in the search for novel materials with exciting new properties (1-9a,b,c). Possible future applications of nanoparticles include the areas of ultrafast data communication and optical data storage (10-12), solar energy conversion (13), and the use of metallic nanoparticles as catalysts (14)(15)(16) because of their high surface-to-volume ratios and different shapes (9c).…”

Section: Introductionmentioning

confidence: 99%

Optical Properties and Ultrafast Dynamics of Metallic Nanocrystals

Link¹,

El‐Sayed

2003

Annu. Rev. Phys. Chem.

1,516

1,499

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Noble metal particles have long fascinated scientists because of their intense color, which led to their application in stained glass windows as early as the Middle Ages. The recent resurrection of colloidal and cluster chemistry has brought about the strive for new materials that allow a bottoms-up approach of building improved and new devices with nanoparticles or artificial atoms. In this review, we discuss some of the properties of individual and some assembled metallic nanoparticles with a focus on their interaction with cw and pulsed laser light of different energies. The potential application of the plasmon resonance as sensors is discussed.

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Section: Introductionmentioning

confidence: 99%

Optical Properties and Ultrafast Dynamics of Metallic Nanocrystals

Link¹,

El‐Sayed

2003

Annu. Rev. Phys. Chem.

1,516

1,499

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“…A possibility that metallic platinum particles are formed during the process can be ruled out by our experiments with metallic nanoparticles (prepared by reduction of a THF solution of [19], which proved completely inactive, and by the fact that XPS studies of the used catalyst did not reveal the presence of any Pt(0).…”

Section: Effect Of the Temperature And The Stirring Ratementioning

confidence: 97%

Further studies on hydration of alkynes by the PtCl4–CO catalyst

Israelsohn

Vollhardt

Blum

2002

Journal of Molecular Catalysis A: Chemical

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Dedicated to Professor Myron Rosenblum on the occasion of his 75 th birthday in recognition of his outstanding contribution to chemistry AbstractUnder CO atmosphere, between 80 and 120˚C, a glyme solution of PtCl 4 forms a carbonyl compound that promotes hydration of internal as well as terminal alkynes to give aldehyde-free ketones. The catalytic process depends strongly on the electronic and steric nature of the substrates. Part of the carbonyl functions of the catalyst can be replaced by phosphine ligands. Chiral DIOP reacts with the PtCl 4 -CO compound to give a catalyst that promotes partial kinetic resolution of a racemic alkyne. Replacement of part of the CO by polystyrene-bound diphenylphosphine enables to attach the catalyst to the polymeric support. Upon entrapment of the platinum compound in a silica sol-gel matrix, it reacts as a partially recyclable catalyst. A reformulated mechanism for the PdCl 4 -CO catalyzed hydration is suggested on the basis of the present study.

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“…The 1 H and 13 C NMR spectra of octanethiol protected ruthenium particles point to the absence of exchange between free and coordinated ligands at the NMR time scale. In this case it is possible to observe by 13 C NMR the carbon atoms of the alkyl chain of the coordinated ligand as broad peaks except for the carbons located in the α and β positions relative to sulphur which are too broad to be observed.…”

Section: Stabilization By Ligandsmentioning

confidence: 99%

“…It is then essential to control these surface species. In this respect, the well-known reduction methods [12][13][14][15] display limitations due to their lack of variability. The use of reverse micelles as "nanoreactors" inside which salt reduction and particle growth occurs has allowed to obtain monodisperse nano-objects which may display a define shape (spheres, rods, wires) and which may self-assemble on various substrates [16,17].…”

Section: Introductionmentioning

confidence: 99%

Organometallic Nanoparticles of Metals or Metal Oxides

Chaudret

Philippot

2007

Oil & Gas Science and Technology - Rev. IFP

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*Dedicated to Yves Chauvin for his exceptional and exemplary contribution to organometallic chemistry and catalysis Ce manuscrit est dédié à Yves Chauvin pour sa contribution exceptionnelle et exemplaire à la chimie organométallique et à la catalyse Résumé -Revue sur la synthèse de nanoparticules de métaux et d'oxydes métalliques -Nous présentons dans cet article une revue sur la synthèse de nanoparticules de métaux et d'oxydes métalliques utilisant une approche organométallique et plus précisément des complexes de ligands hydrocarbures comme précurseurs. L'avantage principal de cette approche réside dans la décomposition facile de ces précurseurs qui peut être effectuée dans des conditions douces et qui ne génère aucun polluant potentiel des nanoparticules. Ceci permet le contrôle de la taille, de la forme et de l'état de surface des nanoparticules formées. Les résultats sont présentés par métaux et par mode de stabilisation (polymères, ligands, liquides ioniques). Nous présentons également quelques résultats concernant l'utilisation de cette approche pour la préparation de matériaux hybrides contenant des nanoparticules incluses dans des matrices minérales (membranes d'alumine, silice mésoporeuse). Enfin nous décrivons également une extension de cette approche pour la synthèse directe de nanoparticules en lit fluidisé. Abstract -Organometallic Nanoparticles of Metals or Metal Oxides

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Nanoscale colloidal metals and alloys stabilized by solvents and surfactants Preparation and use as catalyst precursors

Cited by 347 publications

References 86 publications

Optical Properties and Ultrafast Dynamics of Metallic Nanocrystals

Optical Properties and Ultrafast Dynamics of Metallic Nanocrystals

Further studies on hydration of alkynes by the PtCl4–CO catalyst

Organometallic Nanoparticles of Metals or Metal Oxides

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