title: CFA-2 and CFA-3 (Coordination Framework Augsburg University-2 and -3); novel MOFs assembled from trinuclear Cu(I)/Ag(I) secondary building units and 3,3',5,5'-tetraphenyl-bipyrazolate ligands.
abstract: The syntheses of H2-phbpz, [Cu2(phbpz)]·2DEF·MeOH (CFA-2) and [Ag2(phbpz)] (CFA-3) (H2-phbpz = 3,3',5,5'-tetraphenyl-1H,1'H-4,4'-bipyrazole) compounds and their crystal structures are described. The Cu(I) containing metal-organic framework CFA-2 crystallizes in the tetragonal crystal system, within space group I4(1)/a (no. 88) and the following unit cell parameters: a = 30.835(14), c = 29.306(7) Å, V = 27 865(19) Å(3). CFA-2 features a flexible 3-D three-connected two-fold interpenetrated porous structure constructed of triangular Cu(I) subunits. Upon exposure to different kinds of liquids (MeOH, EtOH, DMF, DEF) CFA-2 shows pronounced breathing effects. CFA-3 crystallizes in the monoclinic crystal system, within space group P2(1)/c (no. 14) and the following unit cell parameters: a = 16.3399(3), b = 32.7506(4), c = 16.2624(3) Å, β = 107.382(2)°, V = 8305.3(2) Å(3). In contrast to the former compound, CFA-3 features a layered 2-D three-connected structure constructed from triangular Ag(i) subunits. Both compounds are characterized by elemental and thermogravimetric analyses, single crystal structure analysis and X-ray powder diffraction, FTIR- and fluorescence spectroscopy. Preliminary results on oxygen activation in CFA-2 are presented and potential improvements in terms of framework robustness and catalytic efficiency are discussed.
authors.affiliation: Institute of Physics, Chair of Solid State and Materials Chemistry, Augsburg University, Universitätsstrasse 1, D-86159 Augsburg, Germany.
authors.forename: Maciej
authors.initials: M
authors.lastname: Grzywa
authors.forename: Christof
authors.initials: C
authors.lastname: Geßner
authors.forename: Dmytro
authors.initials: D
authors.lastname: Denysenko
authors.forename: Björn
authors.initials: B
authors.lastname: Bredenkötter
authors.forename: Fabienne
authors.initials: F
authors.lastname: Gschwind
authors.forename: Katharina M
authors.initials: KM
authors.lastname: Fromm
authors.forename: Wojciech
authors.initials: W
authors.lastname: Nitek
authors.forename: Elias
authors.initials: E
authors.lastname: Klemm
authors.forename: Dirk
authors.initials: D
authors.lastname: Volkmer