Well defined metal oxide-supported rhodium hydride complexes were prepared in which the Rh is covalently anchored to the support through a rhodiumoxygen bond. The various complexes differ in their ligand environments and, as a result, exhibit markedly different behavior as olefin hydrogenation catalysts. Spectral characterization of these complexes was performed and rhodium hydrides were verified as the active species for olefin hydrogenation. Reactivity patterns for these complexes are compared with analogues in homogeneous systems.
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