Flanagan, Keith A.Keith A.FlanaganSullivan, James A.James A.SullivanMüller-Bunz, HelgeHelgeMüller-Bunz2013-01-092013-01-092007 Ameri2007-12-04Langmuirhttp://hdl.handle.net/10197/39984-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.enAqueous-phase palladium nanoparticlesDMAP stabilization1H NMR spectroscopy characterizationAerobic oxidation and selective hydrogen/deuterium (H/D) exchangeJournal Article2325125081252010.1021/la70158972012-11-12https://creativecommons.org/licenses/by-nc-nd/3.0/ie/