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).
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.
Matthes
Jochen
J
Institute of Chemistry, Freie Universität Berlin, Takustrasse 3, D-14195 Berlin, Germany.
Pery
Tal
T
Gründemann
Stephan
S
Buntkowsky
Gerd
G
Sabo-Etienne
Sylviane
S
Chaudret
Bruno
B
Limbach
Hans-Heinrich
HH