A Versatile Approach to the Synthesis of Functionalized Thiol-Protected Palladium Nanoparticles

作者：Cargnello Matteo; Wieder Noah L; Canton Patrizia; Montini Tiziano; Giambastiani Giuliano; Benedetti Alvise; Gorte Raymond J; Fornasiero Paolo^*

来源：Chemistry of Materials, 2011, 23(17): 3961-3969.

DOI：10.1021/cm2014658

• palladium nanoparticles
• thiols
• amphiphilic NPs
• self-assembled monolayers
• mixed monolayers

A synthesis of variably functionalized thiol-protected palladium nanoparticles (Pd-NPs) is presented. The nanoparticle syntheses are performed in acetone-water or tetrahydrofuran-water solutions, without making use of either phase-transfer agents or complex purification procedures of the as-synthesized,nanoparticles Small and mostly monodisperse thiol-protected Pd nanoparticles (Pd-NPs similar to 2 nm) have been prepared with 11-mercaptoundecanoic acid (MUA), 9-mercapto-1-nonanol (MN), 1-dodecanethiol (DT), or mixtures thereof, and a simple sale-up synthesis is also proposed The role of Pd(II)-thiolate species as metal precursors in the stage of nanoparticle synthesis and the influence of the reaction parameters on the final Pd-NPs size and distribution are discussed. The formation of mixed-monolayer protected nanoparticles is achieved, with the final monolayer composition dictated by the thiols, initial molar ratio. Overall, the procedure presented here allows the preparation of functionalized nanoparticles with a high density of functional groups at the edge of the monolayer, with no need of place-exchange reactions. Specific postfunctionalization procedures conducted at the acid groups of the MUA-Pd monolayer are reported so as to widen the potential applicability of these amphiphilic nanoparticle precursors with respect to different applications in the field of material science. Finally, the successful use and the easy recycling/reuse of the Pd-NPs in a model Suzuki cross-coupling reaction are presented.

• 出版日期2011-9-13