Details

Autor(en) / Beteiligte

• Menzel, Saskia
• Millan, Simon
• Höfert, Simon-Patrick
• Nuhnen, Alexander
• Gökpinar, Serkan
• Schmitz, Alexa
• Janiak, Christoph

Titel

Increase of network hydrophilicity from sql to lvt supramolecular isomers of Cu-MOFs with the bifunctional 4-(3,5-dimethyl-1-pyrazol-4-yl)benzoate linker

Ist Teil von

• Dalton transactions : an international journal of inorganic chemistry, 2020-09, Vol.49 (36), p.12854-12864

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The bifunctional linker 4-(3,5-dimethyl-1 H -pyrazol-4-yl)benzoic acid (H 2 mpba) was used for the synthesis of new (square lattice) sql 2D metal-organic frameworks (MOFs) [Cu(Hmpba) 2 ]·L (L = DMF or ACN) in a solvent-mixture of dimethylformamide/water and acetonitrile/water. These sql 2D MOFs are supramolecular isomers of the lvt 3D network [Cu(Hmpba) 2 ]·4MeOH·1H 2 O ( lvt -MeOH) that was synthesized previously by Richardson and co-workers. All these frameworks are potentially porous structures with solvent molecules included in the channels of the as synthesized materials. After activation all three materials showed good CO 2 adsorption capacity, demonstrated here for lvt -MeOH for the first time, with a saturation uptake of 113 cm 3 g −1 ( lvt -MeOH-act.), 111 cm 3 g −1 ( sql -DMF-act.) and 90 cm 3 g −1 ( sql -ACN-act.) at 195 K. The flexibility of the lvt -MeOH-act. network is evidenced by a gate-opening effect seen in the CO 2 measurement at 195 K and under gravimetric high-pressure CO 2 adsorption. According to the water and ethanol sorption measurements the new sql frameworks can be categorized as hydrophobic materials in contrast to the hydrophilic lvt framework. In the lvt -MeOH structure the crystal solvent can be replaced with water to yield the structurally authenticated water-only network lvt -H 2 O containing 3D arrays of S 4 -symmetric (H 2 O) 20 clusters. A slight difference in the H-bonding of the linker pyrazole-NH group changes the framework hydrophilicity drastically.