GUTMANN BRAGA PDF
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Catalytically active dirhodium sheet-like coordination polymers are synthesized from their precursors via braya exchange.
The individual lamellae of gutnann dirhodium-bdc frameworks are stacked as parallel sheets, which are randomly oriented or slightly ordered. Residual trifluoroacetate species are investigated by quantitative 19 F MAS NMR which further reflects the configuration of trifluoroacetate in the obtained Rh 2 -bdc Tfand defects in the structure.
DR-UV-vis and XPS demonstrate that the oxidation state and the Rh—Rh single bond in the dirhodium node are maintained during the ligand substitution process.
The stability and reusability of the catalysts are verified by TG-DTA measurements and leaching tests. The catalysts show similar catalytic efficiency as the homogeneous catalyst in the model cyclopropanation between ethyl diazoacetate EDA and styrene.
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