Transition-Metal Nanoparticles in Imidazolium Ionic Liquids:  Recycable Catalysts for Biphasic Hydrogenation Reactions

Dupont, Jaı̈rton; Fonseca, Glédison S.; Umpierre, Alexandre P.; Fichtner, P.F.P.; Teixeira, Sérgio R.

doi:10.1021/ja025818u

Cited by 782 publications

(493 citation statements)

References 14 publications

Supporting

Mentioning

479

Contrasting

Unclassified

Order By: Relevance

“…Finally, Ag(0)-NPs formed could be rapidly transferred into the RTIL phase, where they would be stabilized by surrounding imidazolium cations. 14 …”

Section: Resultsmentioning

confidence: 99%

“…[10][11][12][13] In the presence of base, C2-H can be easily deprotonated, resulting in N-heterocyclic carbine formation, which can stabilize transition-metal nanocolloids. [14][15][16] Herein, we report a new method for the preparation of size-and shape-controlled Ag-NPs through the use of hydrophobic RTILs in a biphasic system with isopropyl alcohol (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of Silver Nanoparticles in Ultrasonic Vibration-Induced Nanodroplets of Isopropyl Alcohol in Combination with Ionic Liquids

Shin¹,

Hong²,

Kim³

et al. 2011

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

Silver nanoparticles (<10 nm) were prepared in ultrasonic vibration-induced nanodroplets of isopropyl alcohol (IPA) in combination with hydrophobic room temperature ionic liquids (RTILs). The Ag-precursor used were silver (I) complex, Ag 2 (ehac) 2 (eha) 2 (ehac = 2-ethylhexylammonium carbamate; eha = 2-ethylhexylamine), in IPA, while 1-butyl-3-methylimidazolium-based ionic liquids bearing SbF 6 − , PF 6 − and NTf 2 − as counter anions were used as RTILs. During sonication for 10-90 min at room temperature, uniform silver nanoparticles with mean sizes of 2 to 8 nm were rapidly synthesized. Transmission electron micrographs also confirmed that silver nanoparticles have a spherical shape and diverse sizes depending on the reaction time (10-90 min).

show abstract

“…Finally, Ag(0)-NPs formed could be rapidly transferred into the RTIL phase, where they would be stabilized by surrounding imidazolium cations. 14 …”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of Silver Nanoparticles in Ultrasonic Vibration-Induced Nanodroplets of Isopropyl Alcohol in Combination with Ionic Liquids

Shin¹,

Hong²,

Kim³

et al. 2011

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

show abstract

“…[69][70][71] These ligands, however, may stabilize the metal NPs in the same phase as the reactants, making it difficult to separate the catalysts. Strategies to facilitate NPs separation include decantation by using biphasic systems, such as the biphasic system water/organic solvent [72][73][74] or two-phase system with ionic liquids, [75][76][77] and filtration or centrifugation by the immobilization of NPs on organic or inorganic supports. Magnetic separation can be an alternative to the recovery of metal NPs immobilized onto magnetic supports, as recently reviewed.…”

Section: Development Of Magnetically Recoverable Metal Nanoparticle Cmentioning

confidence: 99%

Recent advances in the development of magnetically recoverable metal nanoparticle catalysts

Rossi¹,

Garcia²,

Vono³

2012

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

O objetivo deste Account é fornecer uma visão geral de nossas atividades atuais de pesquisa, as quais envolvem a síntese e modificação de nanomateriais superparamagnéticos para aplicação na área de separação magnética e catálise. Primeiramente, uma introdução ao magnetismo e à separação magnética é feita. Em seguida, estratégias sintéticas que têm sido desenvolvidas para gerar nanopartículas superparamagnéticas revestidas esfericamente por sílica e outros óxidos, com destaque a sistemas bem caracterizados e preparados por metodologias que geram amostras de elevada qualidade e que, a princípio, podem ser produzidas em maior escala, são discutidas. Uma série de catalisadores magneticamente recuperáveis preparados em nosso grupo de pesquisa pela combinação única de suportes superparamagnéticos e nanopartículas metálicas é destacada. Este Account é concluído com observações pessoais e perspectivas neste campo de pesquisa.The aim of this Account is to provide an overview of our current research activities on the design and modification of superparamagnetic nanomaterials for application in the field of magnetic separation and catalysis. First, an introduction of magnetism and magnetic separation is done. Then, the synthetic strategies that have been developed for generating superparamagnetic nanoparticles spherically coated by silica and other oxides, with a focus on well characterized systems prepared by methods that generate samples of high quality and easy to scale-up, are discussed. A set of magnetically recoverable catalysts prepared in our research group by the unique combination of superparamagnetic supports and metal nanoparticles is highlighted. This Account is concluded with personal remarks and perspectives on this research field.

show abstract

“…Thus, the use of imidazolium ionic liquids allowed the formation and the stabilization of iridium nanoparticles [50]. The olefin loss with time has been followed under a constant pressure of H 2 : sigmoidal curves which could be fitted to the A → B, A + B → 2B autocatalytic mechanism characteristic of nanocluster formation and growth were obtained as previously observed by Finke et al The products could be isolated almost quantitatively by simple decantation, and the isolated Ir nanoparticles maintained their efficiency for up to at least seven recycles.…”

Section: Stabilization By Ionic Liquidsmentioning

confidence: 99%

Organometallic Nanoparticles of Metals or Metal Oxides

Chaudret

Philippot

2007

Oil & Gas Science and Technology - Rev. IFP

View full text Add to dashboard Cite

*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

show abstract

Transition-Metal Nanoparticles in Imidazolium Ionic Liquids: Recycable Catalysts for Biphasic Hydrogenation Reactions

Cited by 782 publications

References 14 publications

Preparation of Silver Nanoparticles in Ultrasonic Vibration-Induced Nanodroplets of Isopropyl Alcohol in Combination with Ionic Liquids

Preparation of Silver Nanoparticles in Ultrasonic Vibration-Induced Nanodroplets of Isopropyl Alcohol in Combination with Ionic Liquids

Recent advances in the development of magnetically recoverable metal nanoparticle catalysts

Organometallic Nanoparticles of Metals or Metal Oxides

Contact Info

Product

Resources

About