Dynamic environment at the Zr6 oxo cluster surface is key for the catalytic formation of amide bonds

buir.contributor.orcidKökçüler, İsmail Yaşar|0000-0003-1076-6926en_US
dc.citation.epage110en_US
dc.citation.issueNumber13en_US
dc.citation.spage100en_US
dc.citation.volumeNumber1en_US
dc.contributor.authorZhang, Y.
dc.contributor.authorKökçüler, İsmail Yaşar
dc.contributor.authorAzambuja, F.
dc.contributor.authorParac-Vogt, T.N.
dc.contributor.bilkentauthorKökçüler, İsmail Yaşar
dc.date.accessioned2023-02-16T10:33:28Z
dc.date.available2023-02-16T10:33:28Z
dc.date.issued2022-10-22
dc.departmentDepartment of Chemistryen_US
dc.description.abstractZirconium compounds are an attractive alternative to costly, low abundant metals for the development of inexpensive, readily available, and robust catalysts. The air and moisture stable Zr oxo clusters such as the Zr6O8 species, are of particular interest as they are key building blocks of several Zr-based metal–organic framework (Zr-MOF) catalysts. However, broader use of these cluster-based materials as catalysts is still hampered by the modest understanding of their fundamental reactivity. To bridge this gap, we report on the activity of a soluble Zr6O8 cluster, [Zr6(OH)4O4(OMc)12] (OMc = methacrylate) (Zr6), as a discrete molecular catalyst for the atom-economic formation of amide bonds. This reaction demands two completely different substrates interacting with the Zr6 catalyst, a key step rarely addressed in MOF catalyzed reactions. Remarkably, Zr6 catalyzes the formation of amide bonds directly from non-activated carboxylic acid and amine substrates in ethanol, without requiring anhydrous conditions or water scavenging to achieve good yields. As shown by a series of kinetic, and mechanistic experiments, this promising reactivity arises from a dynamic environment at the cluster surface, where the essential coordination of both substrates requires an excess of amine to enhance the reaction output. Strikingly, Zr6 catalyst tolerates a range of substrates, including (hetero)aromatic, aliphatic, and α-branched acids, even though their nature directly impacts the reaction efficiency. Further, insights for the future design of catalysts based on Zr oxo cluster are discussed through a detailed comparison of Zr6 reactivity with a related Zr12 cluster, and Zr-MOF catalysts. Considering the advantages of zirconium, and the relevance of discrete Zr oxo clusters as building blocks of several MOF materials of varied utility, the molecular level understanding disclosed here contributes at large to the development of novel catalytic entities, and sustainable approaches to synthetic chemistry.en_US
dc.identifier.doi10.1039/D2CY01706Gen_US
dc.identifier.eissn2044-4761
dc.identifier.urihttp://hdl.handle.net/11693/111429
dc.language.isoEnglishen_US
dc.publisherRoyal Society of Chemistryen_US
dc.relation.isversionofhttps://doi.org/10.1039/D2CY01706Gen_US
dc.source.titleCatalysis Science & Technologyen_US
dc.titleDynamic environment at the Zr6 oxo cluster surface is key for the catalytic formation of amide bondsen_US
dc.typeArticleen_US
Files
Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Dynamic_environment_at_the_Zr6_oxo_cluster_surface_is_key_for_the_catalytic_formation_of_amide_bonds.pdf
Size:
1.71 MB
Format:
Adobe Portable Document Format
Description:
Makale Dosyası
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.69 KB
Format:
Item-specific license agreed upon to submission
Description: