Université de Fribourg

Silver coordination polymers with isonicotinic acid derived short polyethylene glycol – Synthesis, structures, anion effect and solution behavior

Fromm, Katharina M. ; Sagué, Jorge L. ; Robin, Adeline Y.

In: Inorganica Chimica Acta, 2013, vol. 403, p. 2–8

Silver coordination compounds and one-dimensional polymers have been studied, using a linear, flexible N-donor ligand. The solid state structures are well known and show panoply of different structures including a large number of polymorphism, pseudo-polymorphism and isomers. We have studied these structures under the influence of anions, solvents and crystallization conditions, studying also...

Université de Fribourg

Of chains and rings: synthetic strategies and theoretical investigations for tuning the structure of silver coordination compounds and their applications

Slenters, Tünde Vig ; Sagué, Jorge L. ; Brunetto, Priscilla S. ; Zuber, Stefanie ; Fleury, Antoine ; Mirolo, Laurent ; Robin, Adeline Y. ; Meuwly, Markus ; Gordon, Oliver ; Landmann, Regine ; Daniels, Alma U. ; Fromm, Katharina M.

In: Materials, 2010, vol. 3, no. 5, p. 3407-3429

Varying the polyethyleneglycol spacer between two (iso)-nicotinic groups of the ligand systems, a large structural variety of silver coordination compounds was obtained, starting with zero-dimensional ring systems, via one-dimensional chains, helices and double-helices to two-dimensional polycatenanes. Theoretical calculations help to understand their formation and allow predictions in some...

Université de Fribourg

Di-Benzo-18-Crown-6 and its Derivatives as Ligands in the Search for Ion Channels

Fromm, Katharina M. ; Bergougnant, Rémi D. ; Robin, Adeline Y.

In: Zeitschrift für anorganische und allgemeine Chemie, 2006, vol. 632, no. 5, p. 828 - 836

Université de Fribourg

On the coordination behaviour of NO₃⁻ in coordination compounds with Ag⁺Part 1. Solubility effect on the formation of coordination polymer networks between AgNO₃ and L(L= ethanediyl bis(isonicotinate) as a function of solvent

Robin, Adeline Y. ; Sagué, Jorge L. ; Fromm, Katharina M.

In: CrystEngComm, 2006, vol. 8, p. 403-416

The influence of the solubility of AgNO₃ in three solvent systems is studied for the reaction between AgNO₃ and the ligand L(= ethanediyl bis(isonicotinate)). Three solid state structures are obtained, differing in the relative ratio Ag : L in the first case, and in polymorphism in the second. The Ag–O(NO₃⁻) distance correlates strongly with the solubility of AgNO₃ in...

Université de Fribourg

Amino acids in iron oxide mineralization: (incomplete) crystal phase selection is achieved even with single amino acids

Mantion, Alexandre ; Gozzo, Fabia ; Schmitt, Bernd ; Stern, Willem B. ; Gerber, Yvonne ; Robin, Adeline Y. ; Fromm, Katharina M. ; Painsi, Monika ; Taubert, Andreas

In: The Journal of Physical Chemistry C, 2008, vol. 112, no. 32, p. 12104–12110

Iron oxides are important minerals in biology and materials science. Using biomimetic synthesis, a variety of iron oxides have been fabricated. However, it is still not clear how growth modifiers like amino acids and peptides select different crystal phases of a complex material like iron oxide. The current paper shows that already with single amino acids, (incomplete) crystal phase selection is...

Université de Fribourg

From simple rings to one-dimensional channels with calix[8]arenes, water clusters, and alkali metal ions

Bergougnant, Rémi D. ; Robin, Adeline Y. ; Fromm, Katharina M.

In: Tetrahedron, 2007, vol. 63, no. 44, p. 10751-10757

The macrocycle 4-tert-butylcalix[8]arene (L) was reacted with alkali metal carbonates (Li₂CO₃, Na₂CO₃, K₂CO₃, Rb₂CO₃, and Cs₂CO₃) at the interface of a biphasic THF/water system. Needle-like crystals with a general formula [Ax(4-tert-butylcalix[8]arene-xH)(THF)y(H₂O)z] (with A=Li, Na, K, Rb, Cs,...