Options
Suzuki coupling activity of an aqueous phase Pd nanoparticle dispersion and a carbon nanotube/Pd nanoparticle composite
Date Issued
2009-07-15
Date Available
2013-01-09T16:18:01Z
Abstract
An aqueous phase dispersion of Pd nanoparticles stabilised by 4-dimethylaminopyridine (DMAP) promotes model Suzuki coupling reactions. The dispersion contains Pd nanoparticles of 3.4 ± 0.5 nm and a Pd(II) species (Pd(DMAP)4(OH)2) which forms following aerobic oxidation of the nanoparticles. The activity of the nanoparticle dispersion in promoting the Suzuki reactions is directly proportional to the size of the halogen on the substrate (as is usual for these coupling reactions) and also to the age of the nanoparticle dispersion. The Pd(DMAP)4(OH)2 complex can be isolated from the dispersion and is found to be very active in promoting the reactions. Its formation following aerobic oxidation of the nanoparticles is proposed as the reason for the improved activity of the dispersion with age. The nanoparticles present in the dispersion can, through displacement of the stabilising ligand, be immobilised onto functionalised multi-walled carbon nanotubes (MWCNTs) and the composite formed is an active and recyclable catalyst. The MWCNT/Pd-DMAP NP composite acts as a reservoir of dissolved Pd species, which function as homogeneous catalysts under reaction conditions.
Type of Material
Journal Article
Publisher
Elsevier
Journal
Catalysis Today
Volume
145
Issue
1-2
Start Page
108
End Page
113
Copyright (Published Version)
2009 Elsevier B.V.
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
File(s)
Owning collection
Scopus© citations
51
Acquisition Date
Mar 28, 2024
Mar 28, 2024
Views
1845
Acquisition Date
Mar 27, 2024
Mar 27, 2024
Downloads
551
Last Week
3
3
Last Month
8
8
Acquisition Date
Mar 27, 2024
Mar 27, 2024