title: Synthesis and porous properties of chromium azolate porous coordination polymers.
abstract: We developed a new route for synthesis of Cr-based porous coordination polymers (PCPs) with azole ligands and characterized the unique open structures by single-crystal X-ray studies and other spectroscopy techniques. Chromium-based PCPs have been prepared from azolate ligands 3,5-dimethyl-1H-pyrazole-4-carboxylic acid (H2dmcpz) and 1,4-di(1H-tetrazole-5yl)benzene (H2BDT) by solvothermal reactions under an Ar atmosphere. [Cr3O(Hdmcpz)6(DMF)3]⊃DMF (1⊃DMF) is a coordination compound that forms a hydrogen-bonded porous network. [Cr3O(HBDT)2(BDT)Cl3)]⊃DMF (2⊃DMF) possesses a new type of trinuclear chromium μ3-O unit cluster and the novel topology of a Cr-based PCP with 700 m(2) g(-1) of Brunauer-Emmett-Teller surface area. [Cr(BDT)(DEF)]⊃DEF (3⊃DEF) is structurally flexible and reactive to O2 molecules because of the unsaturated Cr(2+) centers. This is the first report of a Cr-based PCP/metal-organic framework with noncarboxylate ligands and characterization by single-crystal X-ray diffraction.
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University , Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
authors.forename: Kanokwan
authors.initials: K
authors.lastname: Kongpatpanich
authors.forename: Satoshi
authors.initials: S
authors.lastname: Horike
authors.forename: Masayuki
authors.initials: M
authors.lastname: Sugimoto
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Fukushima
authors.forename: Daiki
authors.initials: D
authors.lastname: Umeyama
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Tsutsumi
authors.forename: Susumu
authors.initials: S
authors.lastname: Kitagawa