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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
    Métadonnées seulement
    Bimetallic ruthenium-tin chemistry: Synthesis and molecular structure of arene ruthenium complexes containing trichlorostannyl ligands
    (2010)
    Therrien, Bruno 
    ;
    Thai, Trieu-Tien
    ;
    Freudenreich, Julien 
    ;
    Süss-Fink, Georg 
    ;
    Shapovalov, Sergey S.
    ;
    Pasynskii, Alexandr A.
    ;
    Plasseraud, Laurent
    A series of neutral, anionic and cationic arene ruthenium complexes contg. the trichlorostannyl ligand were synthesized from SnCl2 and the corresponding arene ruthenium dichloride dimers [(?6-arene)Ru(?2-Cl)Cl]2 (arene = C6H6, PriC6H4Me). While the reaction with triphenylphosphine and stannous chloride only gives the neutral mono(trichlorostannyl) complexes [(?6-C6H6)Ru(PPh3)(SnCl3)Cl] (1) and [(?6-PriC6H4Me)Ru(PPh3)(SnCl3)Cl] (2), the neutral di(trichlorostannyl) complex [(?6-PriC6H4Me)Ru(NCPh)(SnCl3)2] (3) could be obtained for the para-cymene deriv. with benzonitrile as addnl. ligand. By contrast, the analogous reaction with the benzene deriv. leads to a salt composed of the cationic mono(trichlorostannyl) complex [(?6-C6H6)Ru(NCPh)2(SnCl3)]+ (5) and of the anionic tris(trichlorostannyl) complex [(?6-C6H6)Ru(SnCl3)3]- (6). However, [(?6-PriC6H4Me)Ru(?2-Cl)Cl]2 reacts with SnCl2 and hexamethylenetetramine hydrochloride or 18-crown-6 to give the anionic di(trichlorostannyl) complex [(?6-PriC6H4Me)Ru(SnCl3)2Cl]- (4), isolated as the hexamethylenetetrammonium salt or the chloro-tin 18-crown-6 salt. The single-crystal x-ray structure analyses of 1, 2, [(CH2)6N4H][4], [(18-crown-6)SnCl][4] and [5][6] reveal for all complexes a pseudo-tetrahedral piano-stool geometry with ruthenium-tin bonds ranging from 2.56 (anionic complexes) to 2.60 Å (cationic complex). [on SciFinder(R)]
  • Publication
    Accès libre
    Bimetallic ruthenium–tin chemistry: Synthesis and molecular structure of arene ruthenium complexes containing trichlorostannyl ligands
    (2010)
    Therrien, Bruno 
    ;
    Thai, Trieu-Tien
    ;
    Freudenreich, Julien 
    ;
    Süss-Fink, Georg 
    ;
    Shapovalov, Sergey S.
    ;
    Pasynskii, Alexandr A.
    ;
    Plasseraud, Laurent
    A series of neutral, anionic and cationic arene ruthenium complexes containing the trichlorostannyl ligand have been synthesised from SnCl2 and the corresponding arene ruthenium dichloride dimers [(η6-arene)Ru(μ2-Cl)Cl]2 (arene = C6H6, PriC6H4Me). While the reaction with triphenylphosphine and stannous chloride only gives the neutral mono(trichlorostannyl) complexes [(η6-C6H6)Ru(PPh3)(SnCl3)Cl] (1) and [(η6-PriC6H4Me)Ru(PPh3)(SnCl3)Cl] (2), the neutral di(trichlorostannyl) complex [(η6-PriC6H4Me)Ru(NCPh)(SnCl3)2] (3) could be obtained for the para-cymene derivative with benzonitrile as additional ligand. By contrast, the analogous reaction with the benzene derivative leads to a salt composed of the cationic mono(trichlorostannyl) complex [(η6-C6H6)Ru(NCPh)2(SnCl3)]+ (5) and of the anionic tris(trichlorostannyl) complex [(η6-C6H6)Ru(SnCl3)3]− (6). On the other hand, [(η6-PriC6H4Me)Ru(μ2-Cl)Cl]2 reacts with SnCl2 and hexamethylenetetramine hydrochloride or 18-crown-6 to give the anionic di(trichlorostannyl) complex [(η6-PriC6H4Me)Ru(SnCl3)2Cl]− (4), isolated as the hexamethylenetetrammonium salt or the chloro-tin 18-crown-6 salt. The single-crystal X-ray structure analyses of 1, 2, [(CH2)6N4H][4], [(18-crown-6)SnCl][4] and [5][6] reveal for all complexes a pseudo-tetrahedral piano-stool geometry with ruthenium–tin bonds ranging from 2.56 (anionic complexes) to 2.60 Å (cationic complex).
  • Publication
    Métadonnées seulement
    Cluster and polynuclear compounds. Tetrakis-{(?6-1-isopropyl-4-methylbenzene)ruthenium(II)tetraoxomolybdate(VI)}
    (2004)
    Therrien, Bruno 
    ;
    Plasseraud, Laurent
    ;
    Süss-Fink, Georg 
    ;
    Laurencin, Danielle
    ;
    Proust, Anna
    The synthesis of (?6-p-MeC6H4Pr-i)4Ru4Mo4O16, a neutral organoruthenium oxomolybdenum cluster that exists as two structural isomers in soln., one of which can be crystd. from dichloromethane/toluene, is described. In the cryst. state, the mol. contains an unprecedented Ru4Mo4O12 framework, which can be described as a central Mo4O4 cube with four folded ORuO flaps resembling the sails of a windmill. In soln., the windmill structure was found to isomerize to a triple-cubane structure; the equil. was dependent on the nature of the solvent. In chloroform, both isomers are present in a nearly 1:1 ratio, while in dichloromethane the triple-cubane isomer is predominant. [on SciFinder(R)]
  • Publication
    Accès libre
    Hexacatenar liquid-crystalline complexes of palladium(II) and platinum(II) based on trialkoxystilbazole esters
    (2002)
    Plasseraud, Laurent
    ;
    Gonzalez Cuervo, Laura
    ;
    Guillon, Daniel
    ;
    Süss-Fink, Georg 
    ;
    Deschenaux, Robert 
    ;
    Bruce, Duncan W.
    ;
    Donnio, Bertrand
    The synthesis and characterisation of 4-(3,4,5-trialkoxybenzoyloxy)pyridines (1a–e), and of their corresponding palladium(II), (2a–e), and platinum(II), (3a–e), complexes are described. The pyridine-based ligands are not mesomorphic, but upon complexation to PdCl2 or PtCl2, new hexacatenar mesogens are formed which show exclusively the hexagonal columnar mesophase. The mesomorphic behaviour of the complexes was characterised by polarised optical microscopy, differential scanning calorimetry and X-ray diffraction. The metal seems to influence the crystal phase and mesophase stability as well as the mesomorphic temperature range.
  • Publication
    Métadonnées seulement
    Cationic dinuclear arene ruthenium complexes with one hydroxo and two chloro bridges: synthesis and molecular structure of [(p-Me-C6H4 Pr-i)(2)Ru-2(mu-Cl)(2)(mu-OH)][ReO4]
    (2001)
    Fidalgo, Eva Garcia
    ;
    Plasseraud, Laurent
    ;
    Stoeckli-Evans, Helen 
    ;
    Süss-Fink, Georg 
    The dinuclear complexes (arene)(2)Ru2Cl4 (arene = benzene, p-cymene, durene, hexamethylbenzene) react in aqueous solution to give, in addition to the known cationic trichloro complexes [(arene)(2)Ru-2(mu -Cl)(3)](+), the new dichloro hydroxo cations [(arene)(2)Ru-2(mu -Cl)(2)(mu -OH)](+) which can be isolated as the perrhenate salts. (C) 2001 Published by Elsevier Science B.V.
  • Publication
    Métadonnées seulement
    The cluster dication [H6Ru4(C6H6)(4)](2+) revisited: the first cluster complex containing an intact dihydrogen ligand?
    (2000)
    Süss-Fink, Georg 
    ;
    Plasseraud, Laurent
    ;
    Maisse-Francois, Aline
    ;
    Stoeckli-Evans, Helen 
    ;
    Berke, Heinz
    ;
    Fox, Thomas
    ;
    Gautier, Régis
    ;
    Saillard, Jean-Yves
    A low-temperature H-1-NMR study suggests the tetranuclear cluster dication [H6Ru4(C6H6)(4)](2+) (1) to contain an H-2 ligand that undergoes, upon warming of the solution, an intramolecular exchange with the four hydride ligands at the Ru-4 framework. Whereas two of the three NMR signals at - 120 degrees C in the hydride region show T-1 values in the range 200-300 ms, the least deshielded resonance at delta = - 17.33 ppm exhibits a T-1 value of only 34 ms, characteristic of an H-2 ligand. a re-examination of the single-crystal X-ray structure analysis of the chloride salt of 1 supports this interpretation by a short distance of 1.14(0.15) Angstrom between two hydrogen atoms coordinated as a PI-PI ligand in a side-on fashion to one of the triangular faces of the Ru-4 tetrahedron. The distance between one of the two hydrogen atoms of the H-2 ligand and one of the four hydride ligands is also very short [1.33(0.15) Angstrom], suggesting an additional H-2... H interaction. The presence of this H-3, unit over one of the three Ru-3 faces in 1 may explain the deformation of the Ru-4 skeleton from the expected tetrahedral symmetry. Density functional theory (DFT) calculations on 1 indicate a very soft potential energy surface associated with the respective displacement of the three interacting cofacial hydrogen atoms. In accordance with these results, the cluster dication 1 tends to loose molecular hydrogen to form the cluster dication [H4Ru4(C6H6)(4)](2+) (2). The equilibrium between 1 and 2 can be used for catalytic hydrogenation reactions. (C) 2000 Elsevier Science S.A. All rights reserved.
  • Publication
    Métadonnées seulement
    [(eta(6)-p-Pr(i)C6H4Me)(2)Ru2Mo2O6(OMe)(4)]: a new tetranuclear mixed-metal oxo cluster presenting a cube-based chair structure
    (1999)
    Plasseraud, Laurent
    ;
    Stoeckli-Evans, Helen 
    ;
    Süss-Fink, Georg 
    The title complex was obtained by reaction of [(eta(6)-p-Pr'C6H4Me)(4)Ru4Mo4O16] with methanol in the presence of p-hydroquinone. It contains an Mo2Ru2O2(OMe)(4) core consisting of two Mo2RuO(OMe)(3) half-cubes fused together to form a choir-like structure. (C) 1999 Elsevier Science S.A. All rights reserved.
  • Publication
    Métadonnées seulement
    Di-mu-bromo-bis[bromo(eta(6)-para-cymene)-ruthenium(II)] benzene solvate and di-mu-iodo-bis[(eta(6)-para-cymene)iodoruthenium(II)] toluene solvate
    (1999)
    Neels, Antonia
    ;
    Stoeckli-Evans, Helen 
    ;
    Plasseraud, Laurent
    ;
    Fidalgo, Eva Garcia
    ;
    Süss-Fink, Georg 
    The homologous title molecules, [Ru2Br4(C10H14)(2)]. C6H6, (1), and [Ru2I4(C10H14)(2)]. C7H8, (2), consist of arene-ruthenium moieties [Ru-to-ring distances of 1.655 (2) Angstrom in (1) and 1.673(3) Angstrom in (2)] with a terminal halogen ligand and [Ru-Br 2.548 (1) Angstrom in (1) and Ru-I 2.726(1) Angstrom in (2)], held together by two symmetrical halogen bridges [Ru-Br 2.575(1) Angstrom in (1) and Ru-I 2.736(1) Angstrom in (2)]. The arene rings are planar and parallel to each other, and the terminal halogen ligands are coordinated to rurthenium trans with respect to each other. Both molecules possess C-i symmetry.
  • Publication
    Accès libre
    Fixation and spontaneous dehydrogenation of methanol on a triruthenium–iridium framework: synthesis and structure of the cluster anion [HRu3Ir(CO)12(OMe)]–
    (1999)
    Süss-Fink, Georg 
    ;
    Plasseraud, Laurent
    ;
    Ferrand, Vincent
    ;
    Stoeckli-Evans, Helen 
    The anionic mixed-metal cluster [Ru3Ir(CO)13]–1, found to be catalytically active in the carbonylation of methanol, reacts with methanol at 70 °C to give, with O–H activation of the substrate, the cluster anion [HRu3Ir(CO)12(OMe)]–2, which upon prolonged reaction loses formaldehyde to give the cluster anion [H2Ru3Ir(CO)12]–3; both anions 2 and 3 crystallise together as the double-salt [N(PPh3)2]2[HRu3Ir(CO)12(OMe)][H2Ru3Ir(CO)12] the single-crystal X-ray structure analysis of which reveals a butterfly Ru3Ir skeleton for 2 and a tetrahedral Ru3Ir skeleton for 3.
  • Publication
    Métadonnées seulement
    Amphiphilic organoruthenium oxomolybdenum and oxovanadium clusters
    (1998)
    Süss-Fink, Georg 
    ;
    Plasseraud, Laurent
    ;
    Ferrand, Vincent
    ;
    Stanislas, Sandrine
    ;
    Neels, Antonia
    ;
    Stoeckli-Evans, Helen 
    ;
    Henry, Marc
    ;
    Laurenczy, Gábor
    ;
    Roulet, Raymond
    Para-cymene ruthenium dichloride dimer reacts in aqueous solution with sodium molybdate or sodium vanadate to give the amphiphilic clusters [(eta(6)-p-MeC(6)H(4)iPr)(4)Ru4Mo4O16] (1) and [(eta(6)-p-MeC(6)H(4)iPr)(4) Ru4V6O19] (4) respectively. The analogous reaction of hexamethylbenzene ruthenium dichloride dimer with sodium vanadate gives [(eta(6)-C6Me6)(4)Ru4V6O19] (5). The mixed-metal clusters [(eta(6)-p-MkC(6)H(4)iPr) Ru(eta(5)-C5Me5)(3)Rh3Mo4O16] (2) and [(eta(6)-p-MeC(6)H(4)iPr)(2)Ru-2(eta(5)-C5Me5)(2)Rh(2)Mo(4)O16] (3) are accessible from a mixture of para-cymene ruthenium dichloride dimer and pentamethylcyclopentadienyl rhodium dichloride dimer with sodium molybdate in aqueous solution. The crystal structure analyses of 1 and 3 reveal different framework geometries of the metal oxygen skeletons. O-17 NMR spectroscopy and partial charge calculations confirm the presence of three different types of oxygen atoms in 1. (C) 1998 Elsevier Science Ltd. All rights reserved.