title: Synthesis and catalytic properties of soluble platinum nanoparticles protected by a thiol monolayer.
abstract: Several new platinum monolayer protected clusters (MPCs) have been synthesized and characterized. Two methods of platinum reduction were used depending on the solubility of the thiol: sodium borohydride for the water-soluble thiols and lithium triethylborohydride for the organic soluble thiols. In general, reactant solutions containing a 1:1 thiol/Pt ratio yielded the best particles in a single-phase reaction. Higher thiol/Pt ratios produced lower yields of MPCs, while much lower ratios produced gray-black precipitates. The Pt MPCs were used as catalysts to hydrogenate allyl alcohol to propanol by reducing the carbon-carbon double bond. The Pt-mercaptoammonium MPCs were also used as catalysts in the hydrogenation of maleic acid to succinic acid. Differences in the catalytic hydrogenation rates among the various monolayer coatings for MPCs are attributed to the variations in ligand chain length, branching, charged functional groups, packing density, and core size.
authors.affiliation: Department of Chemistry, Vanderbilt University, VU Station B, Nashville, Tennessee 37235-1822, USA.
authors.forename: Sven E
authors.initials: SE
authors.lastname: Eklund
authors.forename: David E
authors.initials: DE
authors.lastname: Cliffel
mesh_terms: D002384:Catalysis; D006865:Hydrogenation; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008298:Maleates / Q000138:chemical synthesis / Q000737:chemistry; D008567:Membranes, Artificial; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission / Q000379:methods; D015394:Molecular Structure; D009944:Organoplatinum Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D020005:Propanols / Q000138:chemical synthesis / Q000737:chemistry; D012680:Sensitivity and Specificity; D012995:Solubility; D013438:Sulfhydryl Compounds / Q000737:chemistry*
chemical_list: D008298:Maleates; D008567:Membranes, Artificial; D009944:Organoplatinum Compounds; D020005:Propanols; D013438:Sulfhydryl Compounds; C006463:allyl alcohol; D010984:Platinum; C030272:maleic acid