Studies on catalytic activity of MIL-53(Al) and structure analogue DUT-5(Al) using bdc- and bpdc-ligands functionalized with l-proline in a solid-solution mixed-linker approach

Add time:09/10/2019    Source:sciencedirect.com

Proline-functionalized MOFs MIL-53(Al) (based on the benzene-1,4-dicarboxylate, bdc linker) and DUT-5(Al) (based on the biphenyl-4,4′-dicarboxylate, bpdc linker) were synthesized using a mixed-linker approach. The proline-functionalized bdc and bpdc ligand was mixed with both the non-functionalized ligand as well as the amino functionalized one. The influence of the length of the linker on the catalytic activity showed a counterintuitive confinement effect and advantageous increase of ee with longer linker and higher porosity, that is a change of ee values from no selectivity in the MIL-53(Al) MOFs up to 16% ee for 27-L-Pro/H2N-DUT-5(Al) and 19% ee for 26-L-Pro/H-DUT-5(Al). The conversion of 4-nitrobenzaldehyde remains over 85% after three catalytic runs for l-proline functionalized MIL-53(Al) MOFs. For the DUT-5(Al) MOFs with l-proline groups this value even increases up to 97%.

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