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Université de Neuchâtel

Tri- and Tetranuclear Mixed-Metal Clusters Containing Alkyne Ligands : Synthesis and Structure of [Ru3Ir(CO)11(RCCR’)]-, [Ru2Ir(CO)9(RCCR’)]-, and [HRu2Ir(CO)9(RCCR’)]

Ferrand, Vincent ; Süss-Fink, Georg ; Neels, Antonia ; Stoeckli-Evans, Helen

In: European Journal of Inorganic Chemistry, 1999, vol. 5, p. 853 - 862

The tetrahedral cluster anion [Ru3Ir(CO)13]- (1) reacts with internal alkynes RCCR to afford the alkyne derivatives [Ru3Ir(CO)11(RCCR)]- (2: R = R’ = Ph; 3: R = R’ = Et; 4: R = Ph; R’ = Me; 5: R = R’ = Me) which have a butterfly arrangement of the Ru3Ir skeleton in which the...

Université de Neuchâtel

Mono-, di- and tetra-nuclear p-cymeneruthenium complexes containing oxalato ligands

Yan, Hong ; Süss-Fink, Georg ; Neels, Antonia ; Stoeckli-Evans, Helen

In: Journal of the Chemical Society, Dalton Transactions, 1997, p. 4345-4350

The oxalato complexes [Ru2(µ-η4-C2O4)Cl2(η6-p-PriC6H4Me)2] 1 and [Ru(η2-C2O4)(NH3)(η6-p-PriC6H4Me)] 2 have been prepared from the reaction of ammonium oxalate with...

Université de Neuchâtel

Oxidative functionalisation of alkanes: synthesis, molecular structure and catalytic implications of anionic vanadium(V) oxo and peroxo complexes containing bidentate N,O ligands

Süss-Fink, Georg ; Stanislas, Sandrine ; Shulpin, Georgiy B. ; Nizova, Galina V. ; Stoeckli-Evans, Helen ; Neels, Antonia ; Bobillier, Christiane ; Claude, Saturnin

In: Journal of the Chemical Society, Dalton Transactions, 1999, p. 3169-3175

A mixture of [NBu4][VO3] and pyrazine-2-carboxylic acid (Hpca) in acetonitrile catalysed smoothly the reaction of alkanes RH (R = CH3 or C6H11) with molecular oxygen (from air) and hydrogen peroxide to give the corresponding alkyl hydroperoxide ROOH as the primary product. The oxo and peroxo anions...

Université de Neuchâtel

Saturated and unsaturated triruthenium clusters containing three sterically demanding phosphine ligands : synthesis and structure of [Ru3(CO)9(PCy3)3] and [Ru3H2(CO)6(PCy3)3]

Süss-Fink, Georg ; Godefroy, Isabelle ; Ferrand, Vincent ; Neels, Antonia ; Stoeckli-Evans, Helen

In: Journal of the Chemical Society, Dalton Transactions, 1998, p. 515-516

The reaction of Na[Ru3H(CO)11] with an excess of tricyclohexylphosphine in methanol afforded, depending on the reaction conditions, the tri-substituted clusters [Ru3(CO)9(PCy3)3] (48e) and [Ru3H2(CO)6(PCy3)3] (44e), inaccessible hitherto.

Université de Neuchâtel

Triruthenium–iridium clusters containing alkyne ligands : synthesis, structure, and catalytic implications of [(µ-H)IrRu3(CO)11(µ3-η2-PhC≡CPh)] and [IrRu3(CO)10(µ4-η2-PhC≡CPh)(µ-η2-PhC=CHPh)]

Ferrand, Vincent ; Süss-Fink, Georg ; Neels, Antonia ; Stoeckli-Evans, Helen

In: Journal of the Chemical Society, Dalton Transactions, 1998, p. 3825-3831

The mixed-metal cluster [HIrRu3(CO)13] 1 reacts with one equivalent of disubstituted alkynes RC≡CR to give [HIrRu3(CO)11(µ3-η2-RC≡CR)] (R = Ph 2; R = Me 3), with a second equivalent of the alkyne the clusters [IrRu3(CO)10(µ4-η2-RC≡CR)(µ-η2-RC=CHR)] (R = Ph 4; R = Me...

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

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

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 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...

Université de Fribourg

Helical zinc complexes of pyrazine–pyridine hybrids

Dias, S. I. G. ; Heirtzler, Fenton ; Bark, Thomas ; Labat, Gael ; Neels, Antonia

In: Polyhedron, 2004, vol. 23 (6), p. 1011-1017

The zinc(II) complexes 1aZnCl₂ and 1bZnCl₂ (1a: 2-(6',2''-bipyrid-2'-yl)-3-(2-pyridyl)pyrazine; 1b: 2-(6',2'-bipyrid-2'-yl)-5,6-dinitrilo-3-(2-pyridyl)pyrazine) were prepared by treatment of the ligands with ZnCl₂. The structures of both were investigated by X-ray crystallography and 1H NMR spectroscopy. Both complexes display proton deshielding phenomena that are attributed to a twisted...