期刊
JOURNAL OF ORGANOMETALLIC CHEMISTRY
卷 689, 期 24, 页码 4601-4610出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2004.09.006
关键词
organometallic; palladium; nanoparticles; Amines; Phosphines; NMR investigations
The synthesis of palladium nanoparticles is performed by hydrogenation of a precursor, Pd-2(dba)(3) (1) or [Pd(C3H5)Cl](2) (2) in the presence of either a weakly coordinating ligand (hexadecylamine, HDA) or good ligands (polyphosphines). It is shown in the case of I that good ligands lead to stable spherical nanoparticles of small size (near 2 nm) whereas the protective effect of HDA depends on the amount of ligand added as a result of equilibria present at the surface of the particles as monitored by solution NMR spectroscopy. The decomposition of 2 being very fast, the particle growth cannot be controlled except in the case of the use of a large excess of HDA which leads to spongelike particles resulting from the agglomeration of initially obtained nanocrystallites. (C) 2004 Elsevier B.V. All rights reserved.
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