Preparation and characterization of 4-dimethylaminopyridine-stabilized palladium nanoparticles
|Title:||Preparation and characterization of 4-dimethylaminopyridine-stabilized palladium nanoparticles||Authors:||Flanagan, Keith A.
Sullivan, James A.
|Permanent link:||http://hdl.handle.net/10197/3998||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||Copyright (published version):||2007 American Chemical Society||Keywords:||Aqueous-phase palladium nanoparticles;DMAP stabilization;1H NMR spectroscopy characterization;Aerobic oxidation and selective hydrogen/deuterium (H/D) exchange||DOI:||10.1021/la7015897||Language:||en||Status of Item:||Peer reviewed|
|Appears in Collections:||Chemistry Research Collection|
Show full item record
Page view(s) 50102
This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. For other possible restrictions on use please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.