Polyoxoanion- and tetrabutylammonium-stabilized Rh(o){sub n} nanoclusters: Unprecedented nanocluster catalytic lifetime in solution
The solution catalytic lifetimes of polyoxoanion- and tetrabutylammonium-stabilized Rh(0) nanoclusters have been investigated, including comparison to the lifetimes of [RhCl(PPh{sub 3}){sub 3}] (Wilkinson's catalyst), [(1,5-COD)Rh(CH{sub 3}CN){sub 2}]BF{sub 4}, and 5% Rh/Al{sub 2}O{sub 3} under identical conditions. These Rh(0) nanoclusters, derived from the polyoxoanion-supported organometallic precursor [(n-C{sub 4}H{sub 9}){sub 4}N]{sub 5}Na{sub 3}[(1,5-COD)Rh{center{underscore}dot}P{sub 2}W{sub 15}Nb{sub 3}O{sub 62}], exhibit catalytic lifetimes that are the longest lifetimes reported for a transition metal nanocluster catalyst in solution, {ge}193,000 turnovers for olefin hydrogenation. The Rh(0) nanocluster catalytic lifetimes approach those of a solid-oxide-supported heterogeneous Rh(0) catalyst and are in order of magnitude higher than any previously reported for an unsupported nanocluster in solution. The results are of significance in that they provide the catalytic lifetime evidence needed to support the concept of highly stabilized nanocluster catalysts, such as the present polyoxoanion- and tetrabutylammonium-stabilized nanoclusters, serving as soluble heterogeneous catalysts.
- Research Organization:
- Colorado State Univ., Fort Collins (US)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG06-89ER13998
- OSTI ID:
- 20000045
- Journal Information:
- Journal of the American Chemical Society, Vol. 121, Issue 38; Other Information: PBD: 29 Sep 1999; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
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