Liu, Jiquan and Groszewicz, Pedro B. and Wen, Qingbo and Thankamony, Aany Sofia Lilly and Zhang, Bin and Kunz, Ulrike and Sauer, Grit and Xu, Yeping and Gutmann, Torsten and Buntkowsky, Gerd (2017):
Revealing Structure Reactivity Relationships in Heterogenized Dirhodium Catalysts by Solid-State NMR Techniques.
In: The Journal of Physical Chemistry C, 121 (32), ACS Publications, pp. 17409-17416, ISSN 1932-7447,
DOI: 10.1021/acs.jpcc.7b06807,
[Online-Edition: https://doi.org/10.1021/acs.jpcc.7b06807],
[Article]
Abstract
Heterogenized dirhodium catalysts were prepared by anchoring the rhodium(II) trifluoroacetate dimer (Rh2(TFA)4) (TFA = trifluoroacetate) on the surface of the SBA-15 material bearing either amine or amine and carboxyl groups. After basic characterizations, the binding geometries of the catalysts were analyzed by 13C CP MAS and 15N CP MAS DNP NMR. 19F MAS NMR measurements were employed to quantify active catalyst sites in the heterogenized catalysts, which enables one to understand their catalytic performance in the cyclopropanation model between styrene and ethyl diazoacetate (EDA). The heterogeneous nature of the catalysts was confirmed by leaching and recyclability tests.
| Item Type: | Article |
|---|---|
| Erschienen: | 2017 |
| Creators: | Liu, Jiquan and Groszewicz, Pedro B. and Wen, Qingbo and Thankamony, Aany Sofia Lilly and Zhang, Bin and Kunz, Ulrike and Sauer, Grit and Xu, Yeping and Gutmann, Torsten and Buntkowsky, Gerd |
| Title: | Revealing Structure Reactivity Relationships in Heterogenized Dirhodium Catalysts by Solid-State NMR Techniques |
| Language: | English |
| Abstract: | Heterogenized dirhodium catalysts were prepared by anchoring the rhodium(II) trifluoroacetate dimer (Rh2(TFA)4) (TFA = trifluoroacetate) on the surface of the SBA-15 material bearing either amine or amine and carboxyl groups. After basic characterizations, the binding geometries of the catalysts were analyzed by 13C CP MAS and 15N CP MAS DNP NMR. 19F MAS NMR measurements were employed to quantify active catalyst sites in the heterogenized catalysts, which enables one to understand their catalytic performance in the cyclopropanation model between styrene and ethyl diazoacetate (EDA). The heterogeneous nature of the catalysts was confirmed by leaching and recyclability tests. |
| Journal or Publication Title: | The Journal of Physical Chemistry C |
| Volume: | 121 |
| Number: | 32 |
| Publisher: | ACS Publications |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids 11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy 07 Department of Chemistry 07 Department of Chemistry > Fachgebiet Anorganische Chemie |
| Date Deposited: | 15 Jan 2018 09:51 |
| DOI: | 10.1021/acs.jpcc.7b06807 |
| Official URL: | https://doi.org/10.1021/acs.jpcc.7b06807 |
| Funders: | Financial support by the Deutsche Forschungsgemeinschaft (DFG) under contracts Bu-911-20-1 (DNP spectrometer) and Bu-911-26-1 is gratefully acknowledged. |
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