Preparation and characterization of 4-dimethylaminopyridine-stabilized palladium nanoparticles

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Title: Preparation and characterization of 4-dimethylaminopyridine-stabilized palladium nanoparticles
Authors: Flanagan, Keith A.
Sullivan, James A.
Müller-Bunz, Helge
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Date: 4-Dec-2007
Abstract: 4-Dimethylaminopyridine (DMAP)-stabilized palladium nanoparticles with a mean diameter of 3.4 +/- 0.5 mn are prepared from the aqueous phase reduction of Na2PdCl4 using NaBH4 in the presence of DMAP. TEM and UV-vis spectroscopy characterization of the nanoparticle dispersion shows no obvious change in the nanoparticles several months after preparation. H-1 NMR spectroscopy of the nanoparticles shows that the nanoparticle dispersion also contains a boron/DMAP complex and two palladium/DMAP complexes. One of the palladium complexes crystallizes out of the dispersion and is identified as Pd(DMAP)(4)(OH)(2) by X-ray crystallography. Following extensive analysis, it is believed that the palladium/DMAP complexes are formed following the oxidation of the palladium nanoparticles. The prepared nanoparticle dispersion promotes selective hydrogen/deuterium (H/D) exchange on the carbon atoms alpha to the endocyclic nitrogen atom on the DMAP-stabilizing ligands through reaction with D2O. This activity is attributed to the presence of the nanoparticles rather than to the presence of the oxidized palladium/DMAP complexes.
Funding Details: Not applicable
Type of material: Journal Article
Publisher: American Chemical Society
Journal: Langmuir
Volume: 23
Issue: 25
Start page: 12508
End page: 12520
Copyright (published version): 2007 American Chemical Society
Keywords: Aqueous-phase palladium nanoparticlesDMAP stabilization1H NMR spectroscopy characterizationAerobic oxidation and selective hydrogen/deuterium (H/D) exchange
DOI: 10.1021/la7015897
Language: en
Status of Item: Peer reviewed 2013-01-09T16:39:55Z
Appears in Collections:Chemistry Research Collection

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