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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
    Remarkable Anticancer Activity of Triruthenium-Arene Clusters Compared to Tetraruthenium-Arene Clusters
    (2007)
    Therrien, Bruno 
    ;
    Ang, Wee Han
    ;
    Chérioux, Frédéric
    ;
    Vieille-Petit, Ludovic
    ;
    Juillerat-Jeanneret, Lucienne
    ;
    Süss-Fink, Georg 
    ;
    Dyson, Paul J.
    The in vitro activity of a series of ruthenium clusters, [(η6-C6H6)(η6-C6Me6)2Ru3 (μ-H)3 (μ3-O)][BF4], [(η6-C6H6)(η6-1,4-iPrC6H4Me)(η6-C6Me6)Ru3 (μ-H)3 (μ3-O)][BF4], [(η6-C6H6)4Ru4 (μ-H)4][BF4]2, [(η6-C6H5Me)4Ru4 (μ-H)4][BF4]2 and [(η6-C6H6)4Ru4 (μ-H)3 (μ-OH)][Cl]2, has been evaluated against A2780 and A2780cisR ovarian carcinoma cell lines. Both triruthenium clusters are very active compared to ruthenium compounds in general, whereas the tetraruthenium clusters do not display significant cytotoxicities. Since the triruthenium clusters are known to form supramolecular interactions with arenes and other functions, it is possible that such interactions are also important with respect to their mode of biological activity. The X-ray structure analysis of [(η6-C6H5Me)4Ru4 (μ-H)4][PF6]2 is also reported.
  • Publication
    Accès libre
    Sulfur-containing trinuclear arene ruthenium clusters
    (2005)
    Tschan, Mathieu
    ;
    Therrien, Bruno 
    ;
    Chérioux, Frédéric
    ;
    Süss-Fink, Georg 
    The single-crystal X-ray structure analyses of [HRu3(C6H6)(C6Me6)2(μ3-SC6H4Me)(μ2-O)][BF4]2 ([1][BF4]2), [HRu3(C6H6)(C6Me6)2(μ3-SC6H4Me)(μ2-S)][PF6]2 ([2][PF6]2) and [H2Ru3(1,2,4,5-Me4C6H2)3(μ2-S)(Cl)]PF6([3][PF6]) are presented. The structures show the sulfur ligands to act as bridges between ruthenium atoms. In [1][BF4]2 and [2][PF6]2 the metallic core adopts a nido framework. However, in [3][PF6] the absence of a μ3-SR ligand combined with the presence of one terminal chloro unit gives rise to a closo metallic arrangement.
  • Publication
    Accès libre
    Supramolecular cluster catalysis : facts and problems
    (2004)
    Süss-Fink, Georg 
    ;
    Therrien, Bruno 
    ;
    Vieille-Petit, Ludovic
    ;
    Tschan, Mathieu J.-L.
    ;
    Romakh, Vladimir B.
    ;
    Ward, Thomas R.
    ;
    Dadras, Massoud
    ;
    Laurenczy, Gabor
    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 "open" cluster cation [H2Ru3(C6H6)(C6Me6)2 (O)(OH)]+ (2), which we had ascribed to a reaction with water in the presence of ethylbenzene is simply an oxidation reaction which occurs in the presence of air. (2) The higher catalytic activity observed with ethylbenzene, which we had erroneously attributed to the "open" cluster cation [H2Ru3(C6H6)(C6Me6)2(O)(OH)]+ (2), was due to the formation of RuO2• nH2O, caused by a hydroperoxide contamination present in ethylbenzene.
  • Publication
    Accès libre
    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)]+
    (2001-03-01)
    Faure, Matthieu
    ;
    Tesouro Vallina, Ana
    ;
    Ludovic Petit
    ;
    Stoeckli-Evans, Helen 
    ;
    Süss-Fink, Georg 
    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 markedly on the substrate, an extremely high activity being observed for ethylbenzene. The cationic species present in the catalytic mixture of the ethylbenzene hydrogenation could be isolated as the tetrafluoroborate salt and characterised as the cation [(η6-C6Me6)2(η6-C6H6)Ru3(μ2-H)2(μ2-OH)(μ3-O)]+ (3). With 3 as the catalyst, the catalytic activity is also much higher for other benzene derivatives.