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Université de Fribourg

Self-assembly of Ag(I) helicates with new enantiopure 5,6-Chiragen type ligands

Mamula, Olimpia ; Bark, Thomas ; Quinodoz, Boris ; Stoeckli-Evans, Helen ; Zelewsky, Alexvon

In: Inorganica Chimica Acta, 2018, vol. 475, p. 200–206

Two new chiral bis-bidentate, C2-symmetrical ligands belonging to the Chiragen family have been synthesised and characterised. They are designed for polynuclear self-assemblies since the two (−)-5,6-pinenebipyridines units are connected by bridges whose length and rigidity avoids the coordination of the bipyridine moieties to the same metal centre. The ligand L1 with a 1,4-dimethylene...

Université de Fribourg

Crystal structures of trans-di­chlorido­tetra­kis­[1-(2,6-diiso­propyl­phen­yl)-1H-imidazole-ΚN³]iron(II), trans-di­bromido­tetra­kis­[1-(2,6-diiso­propyl­phen­yl)-1H-imidazole-ΚN³]iron(II) and trans-di­bromido­tetra­kis­[1-(2,6-diiso­propyl­phen­yl)-1H-imidazole-ΚN³]iron(II) diethyl ether disolvate

Mafua, Roger ; Jenny, Titus ; Labat, Gael ; Neels, Antonia ; Stoeckli-Evans, Helen

In: Acta Crystallographica Section E Structure Reports Online, 2014, vol. 70, no. 8, p. 72–76

The title compounds, [FeCl₂(C₁₅H₂₀N₂)₄], (I), [FeBr₂(C₁₅H₂₀N₂)₄], (II), and [FeBr₂(C₁₅H₂₀N₂)₄]·2C₄H₁₀O, (IIb), respectively, all have triclinic symmetry, with (I) and (II) being isotypic. The FeII atoms in each of the structures are located on an inversion center. They have octa­hedral FeX₂N₄ (X = Cl and Br,...

Université de Fribourg

A family of immobilizable chiral bis(pinenebipyridine) ligands

Pöllnitz, Alpár ; Skupienski, Radek ; Stoeckli-Evans, Helen ; Crochet, Aurélien ; Silvestru, Anca ; Fromm, Katharina M. ; Mamula, Olimpia

In: Synlett, 2013, vol. 24, no. 19, p. 2555–2558

New enantiopure ligands containing two (–)-5,6-pinenebipyridine units connected by a bridge situated in position 6′ of the bipyridines have been prepared. The chemically addressable groups of the bridging (hydroxyl or keto) can be covalently bound to various supports in order to heterogenize the ligand.

Université de Fribourg

Probing intermetallic coupling in dinuclear N-heterocyclic carbene ruthenium(II) complexes

Mercs, Laszlo ; Neels, Antonia ; Stoeckli-Evans, Helen ; Albrecht, Martin

In: Inorganic Chemistry, 2011, vol. 50, no. 17, p. 8188–8196

A series of bimetallic N-heterocyclic carbene (NHC) ruthenium(II) complexes were synthesized, which comprise two [RuCl₂(cymene)(NHC)] units that are interlinked via the NHC nitrogens by alkyl chains of different length. Electrochemical characterization revealed two mutually dependent oxidation processes for the complex with a methylene linker, indicating moderate intramolecular electronic...

Université de Fribourg

Synthesis and tunability of abnormal 1,2,3-triazolylidene palladium and rhodium complexes

Poulain, Aurélie ; Canseco-Gonzalez, Daniel ; Hynes-Roche, Rachel ; Müller-Bunz, Helge ; Schuster, Oliver ; Stoeckli-Evans, Helen ; Neels, Antonia ; Albrecht, Martin

In: Organometallics, 2011, vol. 30, no. 5, p. 1021–1029

Palladation of N3-alkylated 1,2,3-triazolium salts with Pd(OAc)₂ afforded a μ²−I₂ bridged bimetallic complex [Pd(trz)I₂]₂ and monometallic bis(carbene) complexes Pd(trz)₂I₂ as a mixture of trans and cis isomers (trz = 1,2,3-triazol-5- ylidene). Addition of excess halide or modification of the palladation procedure from direct functionalization to a transmetalation...

Université de Fribourg

Stereoselective synthesis of cyclometalated iridium(III) complexes: characterization and photophysical properties

Yang, Liangru ; Zelewsky, Alexander von ; Nguyen, Huong P. ; Muller, Gilles ; Labat, Gaël Charles ; Stoeckli-Evans, Helen

In: Inorganica Chimica Acta, 2009, vol. 36, no. 10, p. 3853-3856

The stereoselective synthesis of a highly luminescent neutral Ir(III) complex comprising two bidentate chiral, cyclometalating phenylpyridine derivatives, and one acetylacetonate as ligands is described. The final complex and some intermediates were characterized by X-ray structural analysis, NMR-, CD-, and CPL-spectroscopy.

Université de Fribourg

Main-chain organometallic polymers comprising redox-active iron(II) centers connected by ditopic N-heterocyclic carbenes

Mercs, Laszlo ; Neels, Antonia ; Stoeckli-Evans, Helen ; Albrecht, Martin

In: Dalton Transactions, 2009, vol. 35, p. 7168-7178

Main-chain organometallic polymers were synthesized from bimetallic iron(II) complexes containing a ditopic N-heterocyclic carbene (NHC) ligand [(cp)(CO)LFe(NHC∼NHC)Fe(cp)(CO)L]X₂ (where NHC∼NHC represents a bridging dicarbene ligand, L = I⁻ or CO). Addition of a diimine ligand such as pyrazine or 4,4′-bipyridine, interconnected these bimetallic complexes and gave the...