title: Gated Channels and Selectivity Tuning of CO2 over N2 Sorption by Post-Synthetic Modification of a UiO-66-Type Metal-Organic Framework.
abstract: The highly porous and stable metal-organic framework (MOF) UiO-66 was altered using post-synthetic modifications (PSMs). Prefunctionalization allowed the introduction of carbon double bonds into the framework through a four-step synthesis from 2-bromo-1,4-benzenedicarboxylic acid; the organic linker 2-allyl-1,4-benzenedicarboxylic acid was obtained. The corresponding functionalized MOF (UiO-66-allyl) served as a platform for further PSMs. From UiO-66-allyl, epoxy, dibromide, thioether, diamine, and amino alcohol functionalities were synthesized. The abilities of these compounds to adsorb CO2 and N2 were compared, which revealed the structure-selectivity correlations. All synthesized MOFs showed profound thermal stability together with an increased ability for selective CO2 uptake and molecular gate functionalities at low temperatures.
authors.affiliation: Wacker-Lehrstuhl für Makromolekulare Chemie, Technische Universität München, Lichtenbergstrasse 4, 85747, Garching bei München, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Kronast
authors.affiliation: Lehrstuhl für Technische Chemie II, Technische Universität München, Lichtenbergstrasse 4, 85747, Garching bei München, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Eckstein
authors.affiliation: Wacker-Lehrstuhl für Makromolekulare Chemie, Technische Universität München, Lichtenbergstrasse 4, 85747, Garching bei München, Germany.
authors.forename: Peter T
authors.initials: PT
authors.lastname: Altenbuchner
authors.affiliation: Consortium für elektrochemische Industrie, Wacker Chemie AG, Zielstattstrasse 20, 81379, München, Germany.
authors.forename: Konrad
authors.initials: K
authors.lastname: Hindelang
authors.affiliation: Wacker-Lehrstuhl für Makromolekulare Chemie, Technische Universität München, Lichtenbergstrasse 4, 85747, Garching bei München, Germany.
authors.forename: Sergei I
authors.initials: SI
authors.lastname: Vagin
authors.affiliation: Wacker-Lehrstuhl für Makromolekulare Chemie, Technische Universität München, Lichtenbergstrasse 4, 85747, Garching bei München, Germany.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Rieger
keywords: UiO-66; carbon dioxide sorption; gate effects; metal-organic frameworks; post-synthetic modification