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  4. A remarkable anion effect on palladium nanoparticle formation and stabilization in hydroxyl-functionalized ionic liquids
 
research article

A remarkable anion effect on palladium nanoparticle formation and stabilization in hydroxyl-functionalized ionic liquids

Yuan, Xiao  
•
Yan, Ning  
•
Katsyuba, Sergey A.
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2012
Physical Chemistry Chemical Physics

Pd nanoparticles (NPs) with a small size and narrow size distribution were prepared from the decomposition of Pd(OAc)(2) in a series of hydroxyl-functionalized ionic liquids (ILs) comprising the 1-(2'-hydroxylethyl)-3-methylimidazolium cation and various anions, viz. [C(2)OHmim][OTf] (2.4 +/- 0.5 nm), [C(2)OHmim][TFA] (2.3 +/- 0.4 nm), [C(2)OHmim][BF4] (3.3 +/- 0.6 nm), [C(2)OHmim][PF6] (3.1 +/- 0.7 nm) and [C(2)OHmim][Tf2N] (4.0 +/- 0.6 nm). Compared with Pd NPs isolated from the non-functionalized IL, [C(4)mim][Tf2N] (6.2 +/- 1.1 nm), it would appear that the hydroxyl group accelerates the formation of the NPs, and also helps to protect the NPs from oxidation once formed. Based on the amount of Pd(OAc) 2 that remains after NP synthesis (under the given conditions) the ease of formation of the Pd NPs in the C(2)OHmim-based ILs follows the trend Tf2N , PF6 > BF4 > OTf > TFA. Also, the ability of the [C2OHmim]+-based ILs to prevent the Pd NPs from undergoing oxidation follows the trend Tf2N > PF6 > TFA > OTf > BF4. DFT calculations were employed to rationalize the interactions between Pd NPs and the C(2)OHmim cation and the various anions.

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Type
research article
DOI
10.1039/c2cp23931k
Web of Science ID

WOS:000302363700018

Author(s)
Yuan, Xiao  
Yan, Ning  
Katsyuba, Sergey A.
Zvereva, Elena E.
Kou, Yuan
Dyson, Paul J.  
Date Issued

2012

Published in
Physical Chemistry Chemical Physics
Volume

14

Start page

6026

End page

6033

Subjects

Transition-Metal Nanoparticles

•

Effective Core Potentials

•

Cross-Coupling Reactions

•

Size-Dependent Formation

•

Molecular Calculations

•

Gold Nanoparticles

•

Selective Hydrogenation

•

Ruthenium Nanoparticles

•

Biphasic Hydrogenation

•

Catalysts

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LCOM  
Available on Infoscience
May 4, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/79992
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