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Université de Fribourg

Anion-induced structural diversity of Zn and Cd coordination polymers based on bis-9,10-(pyridine-4-yl)-anthracene, their luminescent properties, and highly efficient sensing of nitro derivatives and herbicides

Vasylevskyi, Serhii I. ; Bassani, Dario M. ; Fromm, Katharina M.

In: Inorganic Chemistry, 2019, vol. 58, no. 9, p. 5646–5653

Luminescent coordination polymers (CPs) of Zn2+ or Cd2+ and bis-9,10-(pyridine-4- yl)-anthracene (BA) show different 1D and 2D topologies depending on the anion used in the precursor. Compounds {[Zn(μ2-BA)(MeOH)2(p-Tos)2]}n (1) and {[Zn(μ2- BA)(MeOH)2(CF3CO2)2]}n (2) form linear structures and {BA@[Zn(μ2-BA) (MeOH)2(H2O)2](CF3SO3)2}n (3) featuring intercalation of uncoordinated BA molecules...

Université de Fribourg

Formation of silver nanoparticles by electron transfer in peptides and c‐cytochromes

Vasylevskyi, Serhii I. ; Kracht, Sonja ; Corcosa, Paula ; Fromm, Katharina M. ; Giese, Bernd ; Füeg, Michael

In: Angewandte Chemie International Edition, 2017, vol. 56, no. 21, p. 5926-5930

The reduction of Ag⁺ ions to Ag⁰ atoms is a highly endergonic reaction step, only the aggregation to Agn clusters leads to an exergonic process. These elementary chemical reactions play a decisive role if Ag nanoparticles (AgNPs) are generated by electron transfer (ET) reactions to Ag⁺ ions. We studied the formation of AgNPs in peptides by photoinduced ET, and in...

Université de Fribourg

A transparent, flexible, ion conductive, and luminescent PMMA ionogel based on a Pt/Eu bimetallic complex and the ionic liquid [Bmim][N(Tf)₂]

Xie, Zai-Lai ; Xu, Hai-Bing ; Geßner, André ; Kumke, Michael U. ; Priebe, Magdalena ; Fromm, Katharina M. ; Taubert, Andreas

In: Journal of Materials Chemistry, 2012, vol. 22, no. 16, p. 8110-8116

Transparent, ion-conducting, luminescent, and flexible ionogels based on the room temperature ionic liquid (IL) 1-butyl-3-methylimidazolium bis(trifluoromethane sulfonyl)imide [Bmim][N(Tf)₂], a PtEu₂ chromophore, and poly(methylmethacrylate) (PMMA) have been prepared. The thermal stability of the PMMA significantly increases with IL incorporation. In particular, the onset weight loss observed...

Université de Fribourg

Indirect solvent assisted tautomerism in 4-substituted phthalimide 2-hydroxy-Schiff bases

Yordanov, Dancho ; Deneva, Vera ; Georgiev, Anton ; Crochet, Aurélien ; Fromm, Katharina M. ; Antonova, Liudmil

In: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2020, vol. 237, p. 118416

The paper presents the synthesis and characterization of two 4-substituted phthalimide 2-hydroxy-Schiff bases containing salicylic (4) and 2-hydroxy-1-naphthyl (5) moieties. The structural differences of 2-hydroxyaryl substituents, resulting in different enol/keto tautomeric behaviour, depending on the solvent environment were studied by absorption UV–Vis spectroscopy. Compound 5 is...

Université de Fribourg

Film-forming polymers containing in the main-chain dibenzo crown ethers with aliphatic (C₁₀−C₁₆), aliphatic−aromatic, or oxyindole spacers

Zolotukhin, Mikhail G. ; Hernández, María del Carmen G. ; Lopez, Ana Maria ; Fomina, Loudmila ; Cedillo, Gerardo ; Nogales, Aurora ; Ezquerra, Tiberio ; Rueda, Daniel ; Colquhoun, Howard M. ; Fromm, Katharina M. ; Ruiz-Treviño, Alberto ; Ree, Moonhor

In: Macromolecules, 2006, vol. 39, no. 14, p. 4696–4703

Novel, linear, soluble, high-molecular-weight, film-forming polymers and copolymers in which main-chain crown ether units alternate with aliphatic (C₁₀−C₁₆) units have been obtained for the first time from aromatic electrophilic substitution reactions of crown ethers by aliphatic dicarboxylic acids followed by reduction of the carbonyl groups. The crown ether unit is dibenzo-18-crown-6,...