title: Dihydroxybenzoquinone as Linker for the Synthesis of Permanently Porous Aluminum Metal-Organic Frameworks.
abstract: Two new dihydroxybenzoquinone-based metal-organic frameworks, ((CH3)2NH2)3[Al4(L1)3(L1(•))3]·3DMF (1, denoted CAU-20) and ((CH3)2NH2)3[Al4(L2)3(L2(•))3]·9DMF (2, denoted CAU-20-Cl2), were synthesized at 120 °C in DMF using 2,5-dihydroxy-p-benzoquinone ((C6H2(OH)2(O)2), H2L1) and 2,5-dichloro-3,6-dihydroxy-p-benzoquinone ((C6Cl2(OH)2(O)2), H2L2), respectively. Compared to other Al-MOFs, which contain carboxylate or phosphonate groups that connect the metal sites, in 1 and 2 the Al(3+) are coordinated by oxido groups. The metal ions are octahedrally surrounded by oxygen atoms of the deprotonated linker molecules to generate honeycomb layers with a metal to linker ratio of Al: L1/L2 = 2:3. The layers contain L1(2-) and L2(2-) ions as well as linker radical ions L1(•3-) and L2(•3-) in a molar ratio of 1 to 1. The presence of radical ions was confirmed by EPR and UV-vis-spectroscopic measurements, and the composition was determined from a combination of PXRD, (1)H NMR, TG, and elemental analyses. Charge balance is accomplished through intercalation of (CH3)2NH2(+) ions which are formed by partial hydrolysis of DMF. In the structures of 1 and 2 the eclipsed layers are AA and ABAB stacked, respectively, and one-dimensional hexagonal channels with diameters of ca. 9 and 6 Å are formed. Both compounds exhibit permanent porosity and have specific surface areas of 1440 and 1430 m(2) g(-1), respectively.
authors.affiliation: Institut für Anorganische Chemie, Christian-Albrechts-Universität , Max-Eyth-Straße 2, D-24118 Kiel, Germany.
authors.forename: Selda
authors.initials: S
authors.lastname: Halis
authors.affiliation: Berzelii Center EXSELENT on Porous Materials and Department of Materials and Environmental Chemistry, Stockholm University , Stockholm, S-106 91 Sweden.
authors.forename: A Ken
authors.initials: AK
authors.lastname: Inge
authors.affiliation: Institut für Anorganische Chemie, Christian-Albrechts-Universität , Max-Eyth-Straße 2, D-24118 Kiel, Germany.
authors.forename: Niklas
authors.initials: N
authors.lastname: Dehning
authors.affiliation: Institut für Anorganische Chemie, Christian-Albrechts-Universität , Max-Eyth-Straße 2, D-24118 Kiel, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Weyrich
authors.affiliation: Institut für Anorganische Chemie, Christian-Albrechts-Universität , Max-Eyth-Straße 2, D-24118 Kiel, Germany.
authors.forename: Helge
authors.initials: H
authors.lastname: Reinsch
authors.affiliation: Institut für Anorganische Chemie, Christian-Albrechts-Universität , Max-Eyth-Straße 2, D-24118 Kiel, Germany.
authors.forename: Norbert
authors.initials: N
authors.lastname: Stock