The synthesis and characterization of an isomorphous series of copper-containing
microporous metal-organic frameworks (MOFs) based on triazolyl isophthalate linkers with the
general formula 3
¥[Cu4(m3-OH)2(R1-R2-trz-ia)3(H2O)x] are presented. Through size adjustment
of the alkyl substituents R1 and/or R2 at the linker, the impact of linker functionalization on
structure-property relationships was studied. Due to the arrangement of the substituents towards the
cavities, the porosity (pore fraction 28%–39%), as well as the pore size can be adjusted by the size of the
substituents of the triazole ring. Thermal analysis and temperature-dependent PXRD studies reveal a
thermal stability of the MOFs up to 230 C due to increasing framework stability through fine-tuning
of the linker substitution pattern. Adsorption of CO2 (298 K) shows a decreasing maximum loading
with increasing steric demand of the substituents of the triazole ring. Furthermore, the selective
oxidation of cyclohexene with tert-butyl hydroperoxide (TBHP) is studied over the MOFs at 323 K
in liquid chloroform. The catalytic activity increases with the steric demand of the substituents.
Additionally, these isomorphous MOFs exhibit considerable robustness under oxidizing conditions
confirmed by CO2 adsorption studies, as well as by the catalytic selective oxidation experiments.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:84596 |
| Date | 06 April 2023 |
| Creators | Junghans, Ulrike, Kobalz, Merten, Erhart, Oliver, Preißler, Hannes, Lincke, Jörg, Möllmer, Jens, Krautscheid, Harald, Gläser, Roger |
| Publisher | MDPI |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 1996-1944, 338 |
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