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Université de Fribourg

Bimetallic salen-based compounds and their potential applications

Finelli, Alba ; Abram, Sarah-Luise ; Hérault, Nelly ; Crochet, Aurélien ; Fromm, Katharina M.

In: Crystal Growth & Design, 2020, vol. 20, no. 8, p. 4945–4958

The new bimetallic coordination compounds [LNiAg(NO3)], [LCuMn(NO3)2], [LCuCu(NO3)2], [LCuZn(NO3)2], and [{LCuBi(NO3)3}(ACN)] have been synthesized from a salen-type ligand L containing two distinct coordination sites to accommodate (different) metal ions M1 and M2. In the solid state, the formation of 1:1 compounds (LCu:M2) is always observed, but interactions between the compounds lead to ...

Université de Fribourg

In vitro cytotoxicity and catalytic evaluation of dioxidovanadium(V) complexes in an azohydrazone ligand environment

Mohanty, Monalisa ; Maurya, Shailendra K. ; Banerjee, Atanu ; Patra, Sushree Aradhana ; Maurya, Mannar R. ; Crochet, Aurélien ; Brzezinski, Krzysztof ; Dinda, Rupam

In: New Journal of Chemistry, 2019, vol. 43, no. 45, p. 17680–17695

Three new anionic dioxidovanadium(V) complexes (HNEt3)[VO2(L)1–3] (1–3) of tridentate binegative aroylhydrazone ligands containing the azobenzene moiety were synthesized and structurally characterized. The aroylhydrazone ligands (H2L1–3) were derived from the condensation of 5-(arylazo) salicylaldehyde derivatives with the corresponding aroyl hydrazides. All the synthesized ligands and...

Université de Fribourg

Sequential multiple-target sensor: In3+, Fe2+, and Fe3+ discrimination by an anthracene-based probe

Finelli, Alba ; Chabert, Valentin ; Hérault, Nelly ; Crochet, Aurélien ; Kim, Cheal ; Fromm, Katharina M.

In: Inorganic Chemistry, 2019, vol. 58, no. 20, p. 13796–13806

Indium is a nonphysiological toxic metal widely used in industry. While misunderstood, its toxicity is proposed to be linked to a perturbation of Fe3+ homeostasis through the binding of In3+ ions to essential iron metalloproteins such as transferrins. Therefore, the monitoring of In3+ and Fe3+ in biological environments is of prime interest for both basic research and diagnosis. Here we...

Université de Fribourg

Tautomerism as primary signaling mechanism in metal sensing: the case of amide group

Deneva, Vera ; Dobrikov, Georgi ; Crochet, Aurélien ; Nedeltcheva, Daniela ; Fromm, Katharina M. ; Antonov, Liudmil

In: Beilstein Journal of Organic Chemistry, 2019, vol. 15, no. 1, p. 1898–1906

The concept for sensing systems using the tautomerism as elementary signaling process has been further developed by synthesizing a ligand containing 4- (phenyldiazenyl)naphthalene-1-ol as a tautomeric block and an amide group as metal capturing antenna. Although it has been expected that the intramolecular hydrogen bonding (between the tautomeric hydroxy group and the nitrogen atom from the...

Université de Fribourg

Diagram, valence-to-core, and hypersatellite Kβ X-ray transitions in metallic chromium

Zeeshan, Faisal ; Hoszowska, Joanna ; Dousse, Jean-Claude ; Sokaras, Dimosthenis ; Weng, Tsu-Chien ; Alonso-Mori, Roberto ; Kavčič, Matjaz ; Guerra, Mauro ; Sampaio, Jorge Miguel ; Parente, Fernando ; Indelicato, Paul ; Marques, José Pires ; Santos, José Paulo

In: X-Ray Spectrometry, 2019, vol. 48, no. 5, p. 351–359

We report on measurements of the Kβ diagram, valence‐to‐core (VtC), and hypersatellite X‐ray spectra induced in metallic Cr by photon single and double K‐shell ionization. The experiment was carried out at the Stanford Synchrotron Radiation Lightsource using the seven‐crystal Johann‐type hard X‐ray spectrometer of the beamline 6‐2. For the Kβ diagram and VtC transitions, the...

Université de Fribourg

Compartmentalization of alkaline-earth metals in salen-type Cu- and Ni-complexes in solution and in the solid state

Finelli, Alba ; Hérault, Nelly ; Crochet, Aurélien ; Fromm, Katharina M.

In: ACS Omega, 2019, vol. 4, no. 6, p. 10231–10242

The precise arrangement of metal ions in type and number by a ligand represents an important challenge in biology as well as in materials science. The preorganization of different metal ions such as alkaline-earth and transition-metal ions is of particular interest for the design of catalysts or precursors of oxides. This study is based on a Ω- shaped salen-derived ligand comprising N2O2 and...