title: Solid-State Reversible Nucleophilic Addition in a Highly Flexible MOF.
abstract: A flexible and porous metal-organic framework, based on Co(II) connectors and benzotriazolide-5-carboxylato linkers, is shown to selectively react with guest molecules trapped in the channels during the sample preparation or after an exchange process. Stimulated by a small crystal shrinking, upon compression or cooling, the system undergoes a reversible, nonoxidative nucleophilic addition of the guest molecules to the metal ion. With dimethylformamide, only part of the penta-coordinated Co atoms transform into hexa-coordinated, whereas with the smaller methanol all of them stepwise increase their coordination, preserving the crystallinity of the solid at all stages. This extraordinary example of chemisorption has enormous implications for catalysis, storage, or selective sieving.
authors.affiliation: Department of Chemistry and Biochemistry, University of Bern , Freiestrasse 3, 3012 Bern, Switzerland.|Swiss Light Source, Paul Scherrer Institute , CH-5232 Villigen, Switzerland.
authors.forename: Arianna
authors.initials: A
authors.lastname: Lanza
authors.affiliation: Department of Chemistry and Biochemistry, University of Bern , Freiestrasse 3, 3012 Bern, Switzerland.
authors.forename: Luzia S
authors.initials: LS
authors.lastname: Germann
authors.affiliation: Department of Chemistry and Biochemistry, University of Bern , Freiestrasse 3, 3012 Bern, Switzerland.|Swiss Light Source, Paul Scherrer Institute , CH-5232 Villigen, Switzerland.
authors.forename: Martin
authors.initials: M
authors.lastname: Fisch
authors.affiliation: Swiss Light Source, Paul Scherrer Institute , CH-5232 Villigen, Switzerland.
authors.forename: Nicola
authors.initials: N
authors.lastname: Casati
authors.affiliation: Department of Chemistry and Biochemistry, University of Bern , Freiestrasse 3, 3012 Bern, Switzerland.
authors.forename: Piero
authors.initials: P
authors.lastname: Macchi