title: Adsorption-desorption induced structural changes of Cu-MOF evidenced by solid state NMR and EPR spectroscopy.
abstract: Adsorption-desorption induced structural changes of Cu(bpy)(H(2)O)(2)(BF(4)),(bpy) (bpy = 4,4'-bipyridine) [Cu-MOF] have been evidenced by combined NMR and EPR spectroscopy. Upon adsorption of probe molecules even at a few mbar, EPR spectra show that they are activated to form complexes at Cu(II) sites, which results in a change of the Cu-MOF's structure as indicated by a high-field shift of the (11)B MAS NMR. After desorption, both EPR and (11)B MAS NMR spectra evidenced that the structure of the Cu-MOF reversibly shifted to the original state. This observation indicates that MOFs can undergo structural changes during processes where adsorption-desorption steps are involved such as gas storage, separation, and catalysis.
authors.affiliation: Department of Chemistry and Applied Bioscience, ETH Zürich, Hönggerberg, Switzerland.
authors.forename: Yijiao
authors.initials: Y
authors.lastname: Jiang
authors.forename: Jun
authors.initials: J
authors.lastname: Huang
authors.forename: Besnik
authors.initials: B
authors.lastname: Kasumaj
authors.forename: Gunnar
authors.initials: G
authors.lastname: Jeschke
authors.forename: Michael
authors.initials: M
authors.lastname: Hunger
authors.forename: Tamas
authors.initials: T
authors.lastname: Mallat
authors.forename: Alfons
authors.initials: A
authors.lastname: Baiker