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Université de Neuchâtel

Cluster build-up in aqueous solution: synthesis, structure, protonation and catalytic properties of the trinuclear cation [(η6-C6H6)(η6-C6Me6)2Ru3(μ2-H)3(μ3-O)]+

Faure, Matthieu ; Jahncke, Manfred ; Neels, Antonia ; Stœckli-Evans, Helen ; Süss-Fink, Georg

In: Polyhedron, 1999, vol. 18, p. 2679-2685

The trinuclear oxo-capped cluster cation [(η6-C6H6)(η6-C6Me6)2Ru3 (μ2-H)3(μ3-O)]+ (2) was synthesised by reacting [(η6-C6Me6)Ru(H2O)3]2+ with...

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

Supramolecular cluster catalysis : facts and problems

Süss-Fink, Georg ; Therrien, Bruno ; Vieille-Petit, Ludovic ; Tschan, Mathieu J.-L. ; Romakh, Vladimir B. ; Ward, Thomas R. ; Dadras, Massoud ; Laurenczy, Gabor

In: Journal of Organometallic Chemistry, 2004, vol. 689, p. 1362-1369

By checking the chemistry underlying the concept of "supramolecular cluster catalysis" we identified two major errors in our publications related to this topic, which are essentially due to contamination problems. (1) The conversion of the "closed" cluster cation [H3Ru3(C6H6)(C6Me6)2(O)]+ (1) into the...

Université de Neuchâtel

Synthesis of a trinuclear cation [H3Ru3(Fc-arene)(C6Me6)2(O)]+ containing a ferrocenyl group tethered to an arene ligand

Vieille-Petit, Ludovic ; Unternährer, Sabine ; Therrien, Bruno ; Süss-Fink, Georg

In: Inorganica Chimica Acta, 2003, vol. 355, p. 335-339

Ferrocene carboxylic acid 2-cyclohexa-1,4-dienyl-ethyl ester (1) is prepared from ferrocene carboxylic acid and 2-cyclohexa-1,4-dienyl-ethanol. This diene reacts with RuCl3•nH2O in refluxing ethanol to afford quantitatively [Ru(Fc-arene)Cl2]2 (2) (Fc-arene=ferrocene carboxylic acid phenethyl ester). The dinuclear complex 2...

Université de Neuchâtel

A model of displacement and strain for arc-shaped mountain belts applied to the Jura arc

Hindle, David ; Besson, Olivier ; Burkhard, Martin

In: Journal of Structural Geology, 2000, vol. 22, p. 1285-1296

A plan view geometric model for simple, parallel, differential displacements is presented. As an analogue for models of arcuate mountain belt formation we use the model to predict strain patterns produced by parallel displacement in front of a rigid versus deformable indenter. A rigid indenter is simulated by an irregular quadrilateral displaced a constant amount along its hinterland boundary. A...

Université de Neuchâtel

Calcite twins, their geometry, appearance and significance as stress-strain markers and indicators of tectonic regime : a review

Burkhard, Martin

In: Journal of Organometallic Chemistry, 1993, vol. 15, p. 351-368

Twin lamellae are a widespread feature in calcites of any type and origin. Twinning in calcite is an important intracrystalline deformation mechanism with low critical resolved shear stress and virtually no temperature dependence. In contrast to most slip systems in rock-forming minerals, twinning therefore permits intracrystalline deformation at very low temperature and very little confining...

Université de Neuchâtel

Isolation and single-crystal X-ray structure analysis of the catalyst–substrate host–guest complexes [C6H6⊂H3Ru3{C6H5(CH2) nOH}(C6Me6)2(O)]+ (n = 2, 3)

Vieille-Petit, Ludovic ; Therrien, Bruno ; Süss-Fink, Georg ; Ward, Thomas R.

In: Journal of Organometallic Chemistry, 2003, vol. 684, p. 117-123

The trinuclear arene-ruthenium cluster cations [H3Ru3{C6H5 (CH2)nOH}(C6Me6)2 (O)]+ (3: n=2, 4: n=3) have been synthesised from the dinuclear precursor [H3Ru2 (C6Me6)2]+ and the mononuclear...

Université de Neuchâtel

Synthesis and molecular structure of the trinuclear ruthenium cluster cations [H3Ru3(C6H6)(C6H2Me4)2(O)]+ and [H3Ru3{C6H5(CH2)2OH}(C6H2Me4)2(O)]+

Vieille-Petit, Ludovic ; Therrien, Bruno ; Süss-Fink, Georg

In: Inorganica Chimica Acta, 2003, vol. 355, p. 394-398

The trinuclear arene–ruthenium cluster cations [H3Ru3(C6H6)(C6H2Me4)2(O)]+ (2) and [H3Ru3{C6H5(CH2)2OH}(C6H2Me4)2(O)]+ (3) have been synthesised from the dinuclear...