Bridging the gap between homogeneous and heterogeneous catalysis: ortho/para H(2) conversion, hydrogen isotope scrambling, and hydrogenation of olefins by Ir(CO)Cl(PPh(3))(2) |
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Authors: | Matthes Jochen Pery Tal Gründemann Stephan Buntkowsky Gerd Sabo-Etienne Sylviane Chaudret Bruno Limbach Hans-Heinrich |
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Institution: | Institute of Chemistry, Freie Universit?t Berlin, Takustrasse 3, D-14195 Berlin, Germany. |
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Abstract: | Some transition metal complexes are known to catalyze ortho/para hydrogen conversion, hydrogen isotope scrambling, and hydrogenation reactions in liquid solution. Using the example of Vaska's complex, we present here evidence by NMR that the solvent is not necessary for these reactions to occur. Thus, solid frozen solutions or polycrystalline powdered samples of homogeneous catalysts may become heterogeneous catalysts. Comparative liquid- and solid-state studies provide novel insight into the reaction mechanisms. |
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