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Université de Fribourg

Catalytically active palladium pyridylidene complexes: pyridinium ionic liquids as N-heterocyclic carbene precursors

Albrecht, Martin ; Stoeckli-Evans, Helen

Pyridinium salts similar to those used as ionic liquid solvents readily undergo palladation in the presence of a base, thus giving palladium-pyridylidene N-heterocyclic carbene complexes that are active catalysts for Suzuki-type cross-coupling reactions.

Université de Neuchâtel

Study of protonation and Zn(II), Cd(II), Cu(II) and Mn(II) complexation with a glutamic acid N-pyrimidine derivative: Crystal structure of a neutral Cd(II) complex of the bianionic ligand

Arranz-Mascarós, P. ; Gutiérrez-Valero, M. D. ; López-Garzón, R. ; López-León, M. D. ; Godino-Salido M. L. ; Santiago-Medina, A. ; Stoeckli-Evans, Helen

In: Polyhedron, 2008, vol. 27, no. 2, p. 623-632

The compound N-(4-amino-1-methyl-5-nitroso-6-oxo-1,6-dihydropyrimidin-2-yl)-(s)-glutamic acid (H3L) was synthesised and structurally characterised by analytical methods and 1H, 13C and 15N NMR spectroscopy. This compound (H3L) shows the same topology as other model receptors previously used to develop chemical functionalization at the...

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 Neuchâtel

An Unexpected Tandem Reaction between N-Butadienyl-N-alkylketeneN,0-Trimethylsilylacetals of Propionamide and Activated Dienophiles like N-Phenylmaleimide or Acryloyl Chloride

Baak, Marcel ; Rubin, Yves ; Franz, Andreas ; Stoeckli-Evans, Helen ; Bigler, Laurant ; Nachbauer, Jürgen ; Neier, Reinhard

In: Chimia, 1993, vol. 47, p. 233-240

Starting from the N-butadienyl-N-alkylpropionamides 1a-1c the corresponding N,0-trimethylsilylacetals could be obtained using the mixture ofLDA and trimethylsilyl chloride in THF. The unexpected reaction sequence Diels-Alder reaction/acylation between the N-butadienyl-N-alkylketene N,0-trimethylsilylacetal ofpropionamide (2a-2b) and...

Université de Neuchâtel

Synthesis, structure and magnetic properties of cobalt(II) and copper(II) coordination polymers assembled by phthalate and 4-methylimidazole

Baca, Svetlana G. ; Malinovskii, Stanislav T. ; Franz, Patrick ; Ambrus, Christina ; Stoeckli-Evans, Helen ; Gerbeleu, Nicolae ; Decurtins, Silvio

In: Journal of Solid State Chemistry, 2004, vol. 177, no. 8, p. 2841-2849

New coordination polymers [M (Pht)(4-MeIm)2 (H2O)]n (M=Co (1), Cu (2); Pht2−=dianion of o-phthalic acid; 4-MeIm=4-methylimidazole) have been synthesized and characterized by IR spectroscopy, X-ray crystallography, thermogravimetric analysis and magnetic measurements. The crystal structures of 1 and 2...

Université de Neuchâtel

Ni(II) coordination compounds based on mixed phthalate and aromatic amine ligands: synthesis, crystal structures and magnetic properties

Baca, Svetlana G. ; Filippova, Irina G. ; Franz, Patrick ; Ambrus, Christina ; Gdaniec, Maria ; Stoeckli-Evans, Helen ; Simonov, Yurii A. ; Gherco, Olesea A. ; Bejan, Tanea ; Gerbeleu, Nicolae ; Decurtins, Silvio

In: Inorganica Chimica Acta, 2005, vol. 358, no. 6, p. 1762-1770

Three new coordination compounds, [Ni(Pht)(Py)2 (H2O)3] (1), [Ni(Pht)(β- Pic)2(H2O)3] • H2O (2) and [Ni(Pht)(1-MeIm)2 (H2O)3] (3) (where Pht2− = dianion of o-phthalic acid; Py = pyridine, β-Pic = 3-methylpyridine, 1-MeIm = 1-methylimidazole), have...

Université de Neuchâtel

Axial versus equatorial coordination of thioether sulfur: Mixed ligand copper(II) complexes of 2-pyridyl-N-(2′-methylthiophenyl)-methyleneimine with bidentate diimine ligands

Balamurugan, Ramalingam ; Palaniandavar, Mallayan ; Stoeckli-Evans, Helen ; Neuburger, Markus

In: Inorganica Chimica Acta, 2006, vol. 359, no. 4, p. 1103-1113

The synthesis, structure and spectral and redox properties of the copper(II) complexes [Cu(pmtpm)Cl2] (1) and [Cu(pmtpm)2](ClO4)2 (6), where pmtpm is the linear tridentate ligand 2-pyridyl-N-(2′-methylthiophenyl)methyleneimine containing a thioether and two pyridine donors, are described. Also, the mixed ligand complexes...

Université de Neuchâtel

A novel blue luminescent high-spin iron(III) complex with interlayer O–HCl bridging: Synthesis, structure and spectroscopic studies

Basu, Chandrama ; Chowdhury, Santanu ; Banerjee, Rajat ; Stoeckli-Evans, Helen ; Mukherjee, Soma

In: Polyhedron, 2007, vol. 26, no. 14, p. 3617-3624

A blue luminescent high-spin (s = 5/2) iron(III) complex, [FeIII(HL1)2]Cl (2), was synthesized with the acyclic tridentate salicylaldehyde 2-pyridyl hydrazone ligand, H2L1 (1), and it can subsequently be deprotonated and methylated into blue luminescent iron(III) complexes, [FeIII(L2)2]Cl (3) and...

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...