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Université de Neuchâtel

[(p-PriC6H4Me)4 Ru4Mo4O16]: an amphiphilic organoruthenium oxomolybdenum cluster presenting a unique framework geometry

Süss-Fink, Georg ; Plasseraud, Laurent ; Ferrand, Vincent ; Stoeckli-Evans, Helen

In: Chemical Communications, 1997, p. 1657-1658

The amphiphilic title compound, easily accessible from (p- cymene)ruthenium dichloride dimer and sodium molybdate in aqueous solution, presents an unprecedented Ru4Mo4O12 framework comprising a central Mo4O4 cube with four folded ORuO flaps resembling the sails of a windmill.

Université de Neuchâtel

Nucleophilic addition reactions on the electron-deficient cluster dication [H4Ru4(C6H6)4]2+ : synthesis and structural characterisation of the water-soluble cluster cations [H3Ru4(C6H6)4 (CO)]+ and [H3Ru4(C6H6)4 (OH)]2

Chérioux, Frédéric ; Maisse-François, Aline ; Neels, Antonia ; Stoeckli-Evans, Helen ; Süss-Fink, Georg

In: Journal of the Chemical Society, Dalton Transactions, 2001, p. 2184-2187

The electron-deficient (58e) cluster cation [H4Ru4(C6H6)4]2+1 was found to react in aqueous solution with simple nucleophiles to give electron-precise (60e) clusters. With carbon monoxide, the cluster cation [H3Ru4(C6H6)4(CO)]+3 is formed. The reaction...

Université de Neuchâtel

Carbonate binding to copper(II) in solution: mixed-ligand complex formation and its application to the isolation and separation of the three isomers of [Cu(bpp)(H2O)][ClO4]2 [bpp = 2,6-bis(pyrrolidin-2-yl)pyridine]

Bernauer, Klaus ; Godefroy, Isabelle ; Cabort, Amel ; Guicher, Nathalie ; Stoeckli-Evans, Helen ; Süss-Fink, Georg

In: Journal of the Chemical Society, Dalton Transactions, 2002, p. 2069-2073

The binding of the carbonate anion to [Cu(meso-bpp)(H2O)]2+ and rac-[Cu(bpp)(H2O)]2+ [bpp = 2,6-bis(pyrrolidin-2-yl)pyridine] in aqueous solution has been investigated. Formation constants of the carbonato complexes [Cu(meso-bpp)(CO3)] and rac-[Cu(bpp)(CO3)] (1.02 × 103 M–1 and...

Université de Neuchâtel

Saturated and unsaturated tetraruthenium clusters containing sterically demanding dicyclohexylphosphido ligands: synthesis and structure of [H4Ru4(CO)8(PCy2)4] and [H5Ru4(CO)8(PCy2)3]

Süss-Fink, Georg ; Godefroy, Isabelle ; Béguin, Alain ; Rheinwald, Gerd ; Neels, Antonia ; Stoeckli-Evans, Helen

In: Journal of the Chemical Society, Dalton Transactions, 1998, p. 2211-2214

The thermal reaction of the dinuclear complex [Ru2(CO)4(O2CH)2(PCy2H)2] with molecular hydrogen in cyclohexane afforded the tetranuclear clusters [H4Ru4(CO)8(PCy2)4] (64e) and [H5Ru4(CO)8(PCy2)3] (62e), both of which have a...

Université de Neuchâtel

Electron counting and bonding analysis in triruthenium clusters containing sulfoximido ligands : true or false electron-deficient systems ?

Saillard, Jean-Yves ; Kahlal, Samia ; Ferrand, Vincent ; Stoeckli-Evans, Helen ; Süss-Fink, Georg

In: Journal of Organometallic Chemistry, 2001, vol. 620, p. 119-126

Triruthenium clusters containing a methylphenylsulfoximido cap or bridge, Ru3(CO)9(μ2-H)[μ3-NS(O)MePh] (1), Ru3(CO)10(μ2-H)[μ3-NS(O)MePh] (2), Ru3(CO)8(μ3-η2-CPhCHBu)[μ3-NS(O)MePh] (3), Ru3...

Université de Neuchâtel

Mono and oligonuclear vanadium complexes as catalysts for alkane oxidation : synthesis, molecular structure, and catalytic potential

Süss-Fink, Georg ; Gonzalez Cuervo, Laura ; Therrien, Bruno ; Stoeckli-Evans, Helen ; Shul’pin, Georgiy B.

In: Inorganica Chimica Acta, 2004, vol. 357, p. 475-484

A series of mono- and oligonuclear vanadium(V) and vanadium(IV) complexes containing various chelating N,O-, N3-, and O2-ligands have been prepared. The biphasic reaction of an aqueous solution of ammonium vanadate and a dichloromethane solution of hexamethylphosphoramide (hmpa) and pyrazine-2-carboxylic acid (pcaH) or pyrazine-2,5-dicarboxylic acid...

Université de Neuchâtel

Catalytic hydrogenation of aromatics under biphasic conditions: isolation and structural characterisation of the cluster intermediate [(η6-C6Me6)2(η6-C6H6)Ru3(μ2-H)2(μ2-OH)(μ3-O)]+

Faure, Matthieu ; Tesouro Vallina, Ana ; Vieille-Petit, Ludovic ; Stoeckli-Evans, Helen ; Süss-Fink, Georg

In: Journal of Organometallic Chemistry, 2001, vol. 621, p. 103-108

The water-soluble cluster cation [(η6-C6Me6)2(η6-C6H6)Ru3(μ2-H)3(μ3-O)]+ (2) catalyses the hydrogenation of benzene and benzene derivatives to give the corresponding cyclohexanes under biphasic conditions. The catalytic activity of 2 depends...

Université de Neuchâtel

Dinuclear ruthenium sawhorse-type complexes containing bridging ligands with ferrocenyl substituents in endo/endo, endo/exo and exo/exo orientations

Auzias, Mathieu ; Therrien, Bruno ; Labat, Gaël ; Stoeckli-Evans, Helen ; Süss-Fink, Georg

In: Inorganica Chimica Acta, 2006, vol. 359, p. 1012-1017

The dinuclear ruthenium complexes Ru2(CO)4(OOCC5H4FeC5H5)2L2 (L = NC5H5: 1, L = PPh3: 2) have been synthesized from Ru3(CO)12, ferrocene carboxylic acid and pyridine or triphenylphosphine, respectively. The single-crystal X-ray structure analysis reveals...

Université de Fribourg

Novel HEXOL-type cyclometallated iridium(III) complexes: stereoselective synthesis and structure elucidation

Yang, Liangru ; Zelewsky, Alexander von ; Stoeckli-Evans, Helen

In: Chemical Communications, 2005, vol. (33), p. 4155

Two diastereoisomers of tetranuclear cyclometallated iridium complexes, either having an inner core of HEXOL-type [Ir(IrCl₂)₃]⁶⁺ unit and a surface of six chiral, didentate, cyclometallated ligands, are stereoselectively synthesized from an enantiopure pinenopyridine derivative.

Université de Fribourg

Diastereoselective synthesis of coordination compounds: a chiral tripodal ligand based on bipyridine units and its ruthenium(II) and iron(II) complexes

Hamann, Christine ; Zelewsky, Alexander von ; Neels, Antonia ; Stoeckli-Evans, Helen

In: Dalton Transactions, 2004, vol. 3, p. 402-406

The enantiomerically pure chiral tris-chelating ligand (+)-(7S,10R)-L(L) comprising three 4,5-pinenobipyridine subunits connected through a mesityl spacer has been synthesized. Complexes of L with RuII and FeII have been prepared and characterised. NMR spectroscopy indicates that...