摘要
Metals with high oxidation states (HOSs) (e.g., +V to +X) are of great interest to chemists, although it is challenging to trigger the reactivity of metals with HOSs, because they are usually highly coordinated to block the approach of reactants. Herein, benefiting from the study of a neutral iridium-aluminum oxide cluster IrAl2O8 that can catalytically oxidize four CO molecules, the reactivity of iridium with nearly a +VI oxidation state was identified. In heteronuclear metal oxide clusters, the exposed metal sites with oxidation states lower than +III have been commonly observed to capture reactants for subsequent reactions. However, the embedded IrVI+ site in the IrAl2O8 cluster is 4-fold coordinated by oxygen atoms, and the direct interaction between IrVI+ and CO is weak. The unique reactivity of IrVI+ toward CO oxidation has been emphasized. The crucial roles of the oxygen atoms coordinated with IrVI+ to modify the electronic structure of Ir during CO oxidation were highlighted.
源语言 | 英语 |
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页(从-至) | 8869-8875 |
页数 | 7 |
期刊 | Journal of Physical Chemistry C |
卷 | 124 |
期 | 16 |
DOI | |
出版状态 | 已出版 - 23 4月 2020 |
已对外发布 | 是 |