title: Influence of perfluorinated end groups on the SFRD of [Pt(cod)Me(C(n)F(2n+1))] onto porous Al(2)O(3) in CO(2) under reductive conditions.
abstract: The optimized synthesis of a range of cyclooctadiene-stabilized Pt complexes that contained different perfluoro-alkane chains, [Pt(cod)Me(Cn F2n+1 )], is presented. These metal-organic compounds were employed in the so-called supercritical fluid reactive deposition (SFRD) in CO2 under reductive conditions to generate metallic nanoparticles on aluminum oxide as a porous support. Thus, Al2 O3 -supported Pt nanoparticles with a narrow particle-size distribution were obtained. At a reduction pressure of 15.5 MPa and a temperature of 353 K, particle diameters of d50 =2.3-2.8 nm were generated. Decreasing the pressure during the reduction reaction led to slightly larger particles whilst decreasing the amount of organometallic precursor in CO2 yielded a decrease in the particle size from x50 =3.2 nm to 2.6 nm and a particle-size distribution of 2.2 nm. Furthermore, substitution of the CH3 end group by the Cn F2n+1 end groups led to a significant drop in Pt loading of about 50 %. Within the series of perfluorinated end groups that were considered, the Pt complex that contained a branched perfluoro-isopropyl group showed the most-interesting results when compared to the control precursor, [Pt(cod)Me2 ] (1).
authors.affiliation: Institute for Organic Chemistry and DFG-Center for Functional Nanostructures, Campus South, Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, 76131, Karlsruhe (Germany), Fax: (+49) 721-608-48581.
authors.forename: Vikas
authors.initials: V
authors.lastname: Aggarwal
authors.forename: Linus F
authors.initials: LF
authors.lastname: Reichenbach
authors.forename: Mirja
authors.initials: M
authors.lastname: Enders
authors.forename: Thierry
authors.initials: T
authors.lastname: Muller
authors.forename: Simone
authors.initials: S
authors.lastname: Wolff
authors.forename: Marlene
authors.initials: M
authors.lastname: Crone
authors.forename: Michael
authors.initials: M
authors.lastname: Türk
authors.forename: Stefan
authors.initials: S
authors.lastname: Bräse
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D005457:Fluoridation; D053768:Metal Nanoparticles / Q000737:chemistry; D010084:Oxidation-Reduction; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D016062:Porosity
chemical_list: D056831:Coordination Complexes; D002245:Carbon Dioxide; D010984:Platinum; D000537:Aluminum Oxide
keywords: fluorinated ligands; nanoparticles; organometallic complexes; platinum; supercritical fluids