Influence of Perfluorinated End Groups on the SFRD of [Pt(cod)Me(CnF2n+1)] onto Porous Al2O3 in CO2 under Reductive Conditions |
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Authors: | Dipl‐Chem Vikas Aggarwal Dipl‐Chem Linus F Reichenbach Dipl‐Chem Mirja Enders Dr Thierry Muller Dipl‐Ing Simone Wolff Marlene Crone Prof?Dr‐Ing Michael Türk Prof?Dr Stefan Bräse |
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Institution: | 1. 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;2. Institute of Technical Thermodynamics and Refrigeration, Campus South, Karlsruhe Institute of Technology, Engler‐Bunte‐Ring 21, 76131, Karlsruhe (Germany), Fax: (+49)721‐608‐42335;3. Institute of Toxicology and Genetics, Campus North, Karlsruhe Institute of Technology, Hermann‐von‐Helmholtz‐Platz 1, 76344 Eggenstein‐Leopoldshafen (Germany) |
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Abstract: | The optimized synthesis of a range of cyclooctadiene‐stabilized Pt complexes that contained different perfluoro‐alkane chains, Pt(cod)Me(CnF2n+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, Al2O3‐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 CnF2n+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 ). |
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Keywords: | fluorinated ligands nanoparticles organometallic complexes platinum supercritical fluids |
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