Université de Fribourg

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

Grzywa, Maciej ; Geßner, Christof ; Denysenko, Dmytro ; Bredenkötter, Björn ; Gschwind, Fabienne ; Fromm, Katharina M. ; Nitek, Wojciech ; Klemm, Elias ; Volkmer, Dirk

In: Dalton Transactions, 2013, vol. 42, no. 19, p. 6909–6921

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...

Université de Fribourg

Effect of increasing ligand length on the structure of silver complexes

Gschwind, Fabienne ; Fromm, Katharina M.

In: CrystEngComm, 2012, p. -

A new series of ligands in which nicotinic acid was linked to different monomethyloligoethers and their corresponding silver complexes were prepared. The crystal structures of the silver compounds were investigated to determine the effect of increasing flexibility of the ligands on coordination to the metal ion and crystal packing. We observed the formation of one-dimensional coordination...

Université de Fribourg

Tetraethylene glycol adducts of alkaline earth halides

Gschwind, Fabienne ; Fromm, Katharina M.

In: Zeitschrift für anorganische und allgemeine Chemie, 2011, vol. 637, no. 12, p. 1871–1879

Reaction of commercially available tetraethylene glycol with different alkaline earth metal halides affords tetraethylene glycol complexes with different coordination numbers at the metal ion and structural features; depending on the ionic radius of the metal ion, one or two ligand molecules will be coordinated to the metal ion. In this article we will first present complexes with...

Université de Fribourg

Synthesis, X-ray crystal structure, thermal and solution studies of a centrosymmetric metal-organic polymer based on proton transfer methodology

Eshtiagh-Hosseini, Hossein ; Hassanpoor, Azam ; Alfi, Nafiseh ; Mirzaei, Masoud ; Fromm, Katharina M. ; Shokrollahi, Ardeshir ; Gschwind, Fabienne ; Karami, Elham

In: Journal of Coordination Chemistry, 2010, vol. 63, no. 18, p. 3175-3186

A 3-D metal-organic coordination polymer based on pyrazine-2,3-dicarboxylic acid (pzdcH₂) formulated as {[Mn(pzdc)(H₂O)₂] · 2H₂O}n (1), was obtained by the treatment of MnCl₂ · 6H₂O with pzdcH₂, 8-hydroxy quinoline (8-HQ), and 2-amino-4-methyl pyridine (ampy). In this study, we describe the synthesis, elemental analysis, IR spectroscopy, TG analysis, and...

Université de Fribourg

From alkaline earth ion aggregates via transition metal coordination polymer networks towards heterometallic single source precursors for oxidic materials

Gschwind, Fabienne ; Crochet, Aurélien ; Maudez, William ; Fromm, Katharina M.

In: CHIMIA International Journal for Chemistry, 2010, vol. 64, no. 5, p. 299-320

Heterometallic oxides are used as materials in many applications, e.g. from ferroelectrics to superconductors. Making these compounds usually requires high temperatures and long reaction times. Molecular precursors may contribute to render their processing shorter and accessible at lower temperatures, thus cheaper in energy and time. In this review article, different approaches toward oxide...

Université de Fribourg

Multitopic ligand design: a concept for single-source precursors

Gschwind, Fabienne ; Sereda, Olha ; Fromm, Katharina M.

In: Inorganic Chemistry, 2009, vol. 48, no. 22, p. 10535–10547

The multitopic ligand O,O′-bisnicotinic acid tetraethylene glycol, L, was designed for the coordination of two distinct types of metal ions. In this work, we describe how the O-donor part of L is used to coordinate to alkaline earth metal ions and that the N-donor atoms of L bind to group 11 elements. This makes L a suitable ligand for the combination of both metal...