Options
Therrien, Bruno
Nom
Therrien, Bruno
Affiliation principale
Fonction
Professeur titulaire
Email
bruno.therrien@unine.ch
Identifiants
Résultat de la recherche
5 Résultats
Voici les éléments 1 - 5 sur 5
- PublicationAccès libreNondestructive Room-Temperature Adsorption of 2,4,6-tri(2t-thienyl)-1,3,5-triazine on a Si-B Interface: High-Resolution STM Imaging and Molecular Modeling(2008)
;Makoudi, Y. ;Palmino, F. ;Duverger, E. ;Arab, M. ;Chérioux, Frédéric ;Ramseyer, C.; ;Tschan, Mathieu J.-L.Organic nanostructures on semiconductors are currently investigated but the surfaces are known to interact strongly with molecules. To reduce the molecule-surface interaction, we used the Si(111)-B √3 × √3R30°. Deposition of isolated 2,4,6-tri(2t-thienyl)-1,3,5-triazine, was achieved at room temperature without modification of their π skeleton. This fascinating arrangement, observed by STM, has been validated by full density functional theory computations onto the entire system. The theoretical results give a clear explanation for the specific adsorption sites of molecules on the substrate. - PublicationAccès libreA Surprising Reaction of Trimethylphosphane with the Unsaturated Diruthenium Complex [(η6-C6Me6)2Ru2 (μ2-H)3]+: Synthesis and Molecular Structure of the Cations [(η6-C6Me6)Ru2 (PMe3)3 (μ2-H)3]+ and [(η6-C6Me6)2Ru2 (PMe3)2(μ2-H)(H)2]+(2007)
;Tschan, Mathieu J.-L. ;Chérioux, Frédéric; Whereas aromatic or aliphatic phosphanes undergo cleavage of the P-C bond in the reaction with [(η6-C6Me6)2Ru2 (μ2-H)3]+ to give phosphido-bridged diruthenium cations of the type [(η6- C6Me6)2Ru2(2-PR2)(μ2-H)2]+, trimethylphosphane surprisingly yields the substitution product [(η6-C6Me6)Ru2 (PMe3)3 (μ2-H)3]+ (1), as well as the racemic intermediate [(η6-C6Me6)2Ru2(PMe3)2(μ2-H)(H)2]+ (2), in the form of the tetrafluoroborate salts. In complex 2, the hydrido ligands are fluxional in solution, as shown by variable-temperature 1H NMR spectroscopy. Cation 1 reacts with p-bromothiophenol to give the complex [(η6-C6Me6)2Ru2 (PMe3)3{μ2-(p-Br-C6H4)-S}(μ2-H)2]+ (3), isolated as the tetrafluoroborate salt. - PublicationAccès libreHighly Selective Hydrogenation of Carbon-Carbon Multiple Bonds Catalyzed by the Cation [(C6Me6)2Ru2 (PPh2)H2]+: Molecular Structure of [(C6Me6)2Ru2 (PPh2)(CHCHPh)H]+, a Possible Intermediate in the Case of Phenylacetylene Hydrogenation(2006)
;Tschan, Mathieu J.-L.; ;Chérioux, FrédéricThe dinuclear cation [(C6Me6)2Ru2 (PPh2)H2]+ (1) has been studied as the catalyst for the hydrogenation of carbon-carbon double and triple bonds. In particular, [1][BF4] turned out to be a highly selective hydrogenation catalyst for olefin functions in molecules also containing reducible carbonyl functions, such as acrolein, carvone, and methyljasmonate. The hypothesis of molecular catalysis by dinuclear ruthenium complexes is supported by catalyst-poisoning experiments, the absence of an induction period in the kinetics of cyclohexene hydrogenation, and the isolation and single-crystal X-ray structure analysis of the tetrafluoroborate salt of the cation[(C6Me6)2Ru2 (PPh2)(CHCHPh)H]+ (2), which can be considered as an intermediate in the case of phenylacetylene hydrogenation. On the basis of these findings, a catalytic cycle is proposed which implies that substrate hydrogenation takes place at the intact diruthenium backbone, with the two ruthenium atoms acting cooperatively in the hydrogen-transfer process. - PublicationAccès libre(μ-Diphenylphosphido-κP:P)-μ-hydrido-(μ-4-hydroxybenzenethiolato-κ2S:S)bis[(η6-hexamethylbenzene)ruthenium(II)] tetrafluoroborate(2006)
;Tschan, Mathieu J.-L. ;Chérioux, Frédéric; ;Karmazin-Brelot, LydiaThe new triple-bridged dinuclear cation [(η6-C6Me6)2Ru2(μ2-p-S-C6H4-OH)(μ2-PPh2)(μ2-H)]+, isolated and characterized as the tetrafluoroborate salt, was prepared by reacting the precursor [(η6-C6Me6)2Ru2(μ2-H)2(μ2-PPh2)](BF4) and p-hydroxythiophenol in refluxing ethanol. The single-crystal X-ray structure analysis of [(η6-C12H18)2Ru2(μ2-S-C6H4-OH)(μ2-H){μ2-P(C6H5)2}](BF4) shows the formation of the meso form; despite the two stereogenic centres the complex is not chiral. - PublicationAccès libreSubsequent Hydride Substitution in (Arene)trihydridodiruthenium Complexes: Synthesis and Structure of Thiolato-Bridged Diruthenium Cations of the Type [H2(arene)2Ru2(p-X-C6H4-S)]+ and [H(arene)2Ru2(p-X-C6H4-S)2]+(2004)
;Tschan, Mathieu J.-L. ;Chérioux, Frédéric; The cationic complexes [HRu2(η6-arene)2{μ2-(p-X-C6H4)-S}2]+ and [H2Ru2(η6-arene)2{μ2-(p-X-C6H4)-S}]+ (arene = 1,2,4,5-Me4C6H2 or C6Me6; X = Br and Me) are accessible in good yields from p-X-C6H4-SH with [H3Ru2(1,2,4,5-Me4C6H2)2][BF4] and [H3Ru2(C6Me6)2][BF4], respectively. The dibromo derivative [HRu2(C6Me6)2(p-Br-C6H4-S)2]+ is found to undergo double Suzuki coupling reactions with 3-thiophene boronic acid to give [HRu2(C6Me6)2(p-C4H3S-C6H4-S)2]+. This dibromo complex is a potential precursor for the insertion of dinuclear hydrido organometallic entities in the main chain of conjugated molecules.