Journal of Physical Chemistry C
Journal of Physical Chemistry C
5 years ago

Revealing Structure Reactivity Relationships in Heterogenized Dirhodium Catalysts by Solid-State NMR Techniques

Revealing Structure Reactivity Relationships in Heterogenized Dirhodium Catalysts by Solid-State NMR Techniques
Grit Sauer, Gerd Buntkowsky, Bin Zhang, Qingbo Wen, Yeping Xu, Pedro B. Groszewicz, Aany Sofia Lilly Thankamony, Torsten Gutmann, Ulrike Kunz, Jiquan Liu
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.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b06807

DOI: 10.1021/acs.jpcc.7b06807

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