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- W2533433961 endingPage "14997" @default.
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- W2533433961 abstract "The activation and conversion of hydrocarbons is one of the most important challenges in chemistry. Transition-metal ions (V, Cr, Fe, Co, etc.) isolated on silica surfaces are known to catalyze such processes. The mechanisms of these processes are currently unknown but are thought to involve C-H activation as the rate-determining step. Here, we synthesize well-defined Co(II) ions on a silica surface using a metal siloxide precursor followed by thermal treatment under vacuum at 500 °C. We show that these isolated Co(II) sites are catalysts for a number of hydrocarbon conversion reactions, such as the dehydrogenation of propane, the hydrogenation of propene, and the trimerization of terminal alkynes. We then investigate the mechanisms of these processes using kinetics, kinetic isotope effects, isotopic labeling experiments, parahydrogen induced polarization (PHIP) NMR, and comparison with a molecular analog. The data are consistent with all of these reactions occurring by a common mechanism, involving heterolytic C-H or H-H activation via a 1,2 addition across a Co-O bond." @default.
- W2533433961 created "2016-10-28" @default.
- W2533433961 creator A5019537622 @default.
- W2533433961 creator A5024317980 @default.
- W2533433961 creator A5024554829 @default.
- W2533433961 creator A5030884217 @default.
- W2533433961 creator A5045560117 @default.
- W2533433961 creator A5049111275 @default.
- W2533433961 creator A5050871990 @default.
- W2533433961 creator A5076245254 @default.
- W2533433961 date "2016-11-07" @default.
- W2533433961 modified "2023-10-07" @default.
- W2533433961 title "C–H Activation on Co,O Sites: Isolated Surface Sites versus Molecular Analogs" @default.
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