Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10244800 | Journal of Catalysis | 2005 | 12 Pages |
Abstract
Pd-PVP colloid (stabilized with polyvinylpyrrolidone) with a diameter of 19.8 nm in [Bu4N]Br medium catalyzes Heck coupling of bromobenzene with butyl acrylate and methoxycarbonylation of iodobenzene reactions. Oxidative addition of PhI or PhBr to Pd-PVP as the first step of a catalytic reaction was confirmed by TEM and XPS measurements. TEM studies showed significant reduction of Pd nanoparticle size after their reaction with PhX (X = I, Br) and [Bu4N]X (X = Cl, Br, I). The biggest shift of the center of nanoparticle size distribution, from 19.8 nm to 7.6 nm, was found when Pd-PVP reacted with PhI and [Bu4N]Br. The formation of [Bu4N]2[Pd(Ph)Br3]- and [Bu4N]2[PdBr4]-type complexes in that system was evidenced by XPS and UV-vis spectra.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
Andrzej Gniewek, Anna M. Trzeciak, Józef J. ZióÅkowski, Leszek KÄpiÅski, Józef Wrzyszcz, WÅodzimierz Tylus,