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Süss-Fink, Georg

Nom
Süss-Fink, Georg
Affiliation principale
Fonction
Professeur ordinaire
Email
georg.suess-fink@unine.ch
Identifiants
https://libra.unine.ch/handle/123456789/385

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  • Publication
    Accès libre
    Synthesis and molecular structure of the trinuclear ruthenium cluster cations [H3Ru3{C6H5(CH2)2OC(O)C6H5}(C6Me6)2(O)]+ and [H3Ru3{C6H5(CH2)2OC(O)(CH2)3C6H5}(C6Me6)2(O)]+
    (2004)
    Vieille-Petit, Ludovic
    ;
    Therrien, Bruno 
    ;
    Süss-Fink, Georg 
    Benzoic acid 2-cyclohexa-1,4-dienyl ethyl ester (1), and 4-phenylbutyric acid 2-cyclohexa-1,4-dienyl ethyl ester (2) are prepared by reacting, respectively, benzoic acid and 4-phenylbutyric acid with 2-cyclohexa-1,4-dienyl ethanol. These dienyl ester derivatives react with RuCl3• n H2O in refluxing ethanol to afford in good yield [Ru{C6H5(CH2)2OC(O)C6H5}Cl2] 2 (3), and [Ru{C6H5(CH2)2OC(O)(CH2)3C6H5}Cl2]2 (4). The trinuclear arene–ruthenium cluster cations [H3Ru3{C6H5 (CH2)2OC(O)C6H5}(C6Me6)2(O)]+ (5), and [H3Ru3{C6H5(CH2)2OC(O)(CH2)3C6H5}(C6Me6)2(O)]+ (6) are synthesised from the dinuclear precursor [H3Ru2(C6Me6)2]+, and the mononuclear complexes [Ru{C6H5(CH2)2OC(O)C6H5}(H2O)3]2+ and [Ru{C6H5(CH2)2OC(O)(CH2)3C6H5}(H2O)3]2+, accessible, respectively, from 3 and 4 in aqueous solution. The water-soluble trinuclear cluster cations 5, and 6 possess a phenyl substituent attach to their side-arm which can act as a substrate for hydrogenation. The single-crystal X-ray structure analyses of [5][PF6], and [6][PF6] have been determined.
  • Publication
    Accès libre
    Synthesis and molecular structure of the trinuclear ruthenium cluster cations [H3Ru3(C6H6)(C6H2Me4)2(O)]+ and [H3Ru3{C6H5(CH2)2OH}(C6H2Me4)2(O)]+
    (2003-11-20)
    Vieille-Petit, Ludovic
    ;
    Therrien, Bruno 
    ;
    Süss-Fink, Georg 
    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 precursor [H3Ru2(C6H2Me4)2]+ (1) and the mononuclear complexes [Ru(C6H6)(H2O)3]2+ and [Ru{C6H5(CH2)2OH}(H2O)3]2+, isolated and characterised as the tetrafluoroborate salts. Cations 2 and 3 are analogues of the cluster cation [H3Ru3(C6H6)(C6Me6)2(O)]+ which was found to catalyse the hydrogenation of benzene to give cyclohexane under biphasic conditions (‘supramolecular cluster catalysis’). The single-crystal X-ray structure analyses of 2 and 3 have been determined. Unlike [2][BF4]•3H2O, [3][PF6]•H2O shows a dimeric structure in the solid state, thanks to hydrogen bonds between the hydroxo function of one molecule of 3, a water molecule and the oxo cap of an other molecule of 3.
  • Publication
    Accès libre
    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)
    (2003-11-01)
    Vieille-Petit, Ludovic
    ;
    Therrien, Bruno 
    ;
    Süss-Fink, Georg 
    ;
    Ward, Thomas R.
    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 complexes [{C6H5(CH2)nOH}Ru(H2O)3]2+ in aqueous solution, isolated and characterised as the hexafluorophosphate or tetrafluoroborate salts. Both 3 and 4 are derivatives of the parent cluster cation [H3Ru3 (C6H6)(C6Me6)2(O)]+ (1) which was found to catalyse the hydrogenation of benzene to give cyclohexane under biphasic conditions. The mechanism postulated for this catalytic reaction (‘supramolecular cluster catalysis’), involving the hydrophobic pocket spanned by the three arene ligands in 1, was based on the assumption that the substrate molecule benzene is hosted inside the hydrophobic pocket of the cluster molecule to form a catalyst–substrate host–guest complex in which the hydrogenation of the substrate takes place. With the analogous cluster cations 3 and 4, containing a (CH2)nOH side-arm (n=2, 3) as substituent at the benzene ligand, it was possible to isolate the cationic host–guest complexes as the hexafluorophosphate or tetrafluoroborate salts. The single-crystal X-ray structure analyses of [C6H6⊂3][PF6] and [C6H6⊂4][BF4], compared to that of [3][PF6] show that the substrate molecule benzene is indeed held inside the hydrophobic pocket of 3 and 4, the angle between the metal (Ru3) plane and the aromatic plane being 67° and 89°, respectively.