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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
    A 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
    ;
    Therrien, Bruno 
    ;
    Süss-Fink, Georg 
    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.
  • Publication
    Accès libre
    Cationic arene ruthenium complexes containing chelating 1,10-phenanthroline ligands
    (2005-07-01)
    Canivet, Jérôme
    ;
    Lydia Karmazin
    ;
    Süss-Fink, Georg 
    The monocationic chloro complexes containing chelating 1,10-phenanthroline (phen) ligands [(arene)Ru(N∩N)Cl] + (1: arene = C6H6, N∩N = phen; 2: arene = C6H6, N∩N = 5-NO2-phen; 3: arene = p-MeC6H4Pri, N∩N = phen; 4: arene = p-MeC6H4Pri, N∩N = 5-NO2-phen; 5: arene = C6Me6, N∩N = phen; 6: arene = C6Me6, N∩N = 5-NO2-phen; 7: arene = C6Me6, N∩N = 5-NH2-phen) have been prepared and characterised as the chloride salts. Hydrolysis of these chloro complexes in aqueous solution gave, upon precipitation of silver chloride, the corresponding dicationic aqua complexes [(arene)Ru(N∩N)(OH2)]2+ (8: arene = C6H6, N∩N = phen; 9: arene = C6H6, N∩N = 5-NO2-phen; 10: arene = p-MeC6H4Pri, N∩N = phen; 11: arene = p-MeC6H4Pri, N∩N = 5-NO2-phen; 12: arene = C6Me6, N∩N = phen; 13: arene = C6Me6, N∩N = 5-NO2-phen; 14: arene = C6Me6, N∩N = 5-NH2-phen), which have been isolated and characterised as the tetrafluoroborate salts. The catalytic potential of the aqua complexes 8–14 for transfer hydrogenation reactions in aqueous solution has been studied: complexes 12 and 14 catalyse the reaction of acetophenone with formic acid to give phenylethanol and carbon dioxide with turnover numbers around 200 (80 °C, 7 h). In the case of 12, it was possible to observe the postulated hydrido complex [(C6Me6)Ru(phen)H]+ (15) in the reaction with sodium borohydride; 15 has been characterised as the tetrafluoroborate salt, the isolated product [15]BF4, however, being impure. The molecular structures of [(C6Me6)Ru(phen)Cl]+ (1) and [(C6Me6)Ru(phen)(OH2)]2+ (12) have been determined by single-crystal X-ray structure analysis of [1]Cl and [12](BF4)2.