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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
    Arene–ruthenium complexes with ferrocene-derived ligands: Synthesis and characterization of complexes of the type [Ru(η6-arene)(NC5H4CH2NHOC-C5H4FeC5H5)Cl2] and [Ru(η6-arene)(NC3H3N(CH2)2O2C–C5H4FeC5H5)Cl2]
    (2009)
    Auzias, Mathieu
    ;
    Gueniat, Joël
    ;
    Therrien, Bruno 
    ;
    Süss-Fink, Georg 
    ;
    Renfrew, Anna K.
    ;
    Dyson, Paul J.
    Arene–ruthenium complexes of general formula [Ru(η6-arene)(L)Cl2] where L = NC5H4CH2NHOC-C5H4FeC5H5, arene = p-iPrC6H4Me (1) or C6Me6 (2); L = NC3H3N(CH2) 2O2C–C5H4FeC5H5, arene = p-iPrC6H4Me (3) or C6Me6 (4), and diruthenium–arene complexes of general formula [Ru(η6-arene)Cl2] 2 (L) where L = 1,1′-(NC5H4CH2NHOC)2-C5H4FeC5H4, arene = p-iPrC6H4Me (5) or C6Me6 (6); L = 1,1′-(NC3H3N(CH2)2O2C)2–C5H4FeC5H4, arene = p-iPrC6H4Me (7) or C6Me6 (8) have been synthesized and characterized. The molecular structures of 1 and 3 were confirmed by single-crystal X-ray diffraction. The in vitro anticancer activities of complexes 1–8 have been studied comparatively to the uncoordinated ligands. The complexes exhibit fairly low cytotoxicities in comparison to related ferrocene-derived arene–ruthenium complexes.
  • Publication
    Accès libre
    Sawhorse-type diruthenium tetracarbonyl complexes containing porphyrin-derived ligands as highly selective photosensitizers for female reproductive cancer cells
    (2009)
    Schmitt, Frédéric
    ;
    Auzias, Mathieu
    ;
    Štěpnička, Petr
    ;
    Sei, Yoshihisa
    ;
    Yamaguchi, Kentaro
    ;
    Süss-Fink, Georg 
    ;
    Therrien, Bruno 
    ;
    Juillerat-Jeanneret, Lucienne
    Diruthenium tetracarbonyl complexes of the type [Ru2 (CO)4(μ2-η2-O2CR)2L2] containing a Ru–Ru backbone with four equatorial carbonyl ligands, two carboxylato bridges, and two axial two-electron ligands in a sawhorse-like geometry have been synthesized with porphyrin-derived substituents in the axial ligands [1: R is CH3, L is 5-(4-pyridyl)-10,15,20-triphenyl-21,23H-porphyrin], in the bridging carboxylato ligands [2: RCO2H is 5-(4-carboxyphenyl)-10,15,20-triphenyl-21,23H-porphyrin, L is PPh3; 3: RCO2H is 5-(4-carboxyphenyl)-10,15,20-triphenyl-21,23H-porphyrin, L is 1,3,5-triaza-7-phosphatricyclo[3.3.1.1]decane], or in both positions [4: RCO2H is 5-(4-carboxyphenyl)-10,15,20-triphenyl-21,23H-porphyrin, L is 5-(4-pyridyl)-10,15,20-triphenyl-21,23H-porphyrin]. Compounds 1–3 were assessed on different types of human cancer cells and normal cells. Their uptake by cells was quantified by fluorescence and checked by fluorescence microscopy. These compounds were taken up by human HeLa cervix and A2780 and Ovcar ovarian carcinoma cells but not by normal cells and other cancer cell lines (A549 pulmonary, Me300 melanoma, PC3 and LnCap prostate, KB head and neck, MDAMB231 and MCF7 breast, or HT29 colon cancer cells). The compounds demonstrated no cytotoxicity in the absence of laser irradiation but exhibited good phototoxicities in HeLa and A2780 cells when exposed to laser light at 652 nm, displaying an LD50 between 1.5 and 6.5 J/cm2 in these two cell lines and more than 15 J/cm2 for the others. Thus, these types of porphyric compound present specificity for cancer cell lines of the female reproductive system and not for normal cells; thus being promising new organometallic photosensitizers.
  • Publication
    Accès libre
    New Dinuclear Ru2(CO)4 Sawhorse-Type Complexes Containing Bridging Carboxylato Ligands
    (2008)
    Auzias, Mathieu
    ;
    Mattsson, Johan
    ;
    Therrien, Bruno 
    ;
    Süss-Fink, Georg 
    The thermal reaction of Ru3(CO)12 with ethacrynic acid, 4-[bis(2-chlorethyl)amino]benzenebutanoic acid (chlorambucil), or 4-phenylbutyric acid in refluxing solvents, followed by addition of two-electron donor ligands (L), gives the diruthenium complexes Ru2 (CO)4(O2CR)2L2 (1: R = CH2O-C6H2Cl2-COC(CH2)C2H5, L = C5H5N; 2: R = CH2O-C6H2Cl2-COC(CH2)C2H5, L = PPh3; 3: R = C3H6-C6H4-N(C2H4-Cl)2, L = C5H5N; 4: R = C3H6-C6H4-N(C2H4-Cl)2, L = PPh3; 5: R = C3H6-C6H5, L = C5H5N; 6: R = C3H6-C6H5, L = PPh3). The single-crystal structure analyses of 2, 3, 5 and 6 reveal a dinuclear Ru2(CO)4 sawhorse structure, the diruthenium backbone being bridged by the carboxylato ligands, while the two L ligands occupy the axial positions of the diruthenium unit.
  • Publication
    Accès libre
    Synthesis, structure and electrochemistry of cationic diruthenium complexes of the type [(N∩N)2Ru2 (CO)2 (μ-CO)2(μ-OOCFc)]+ containing a ferrocenecarboxylato bridge and two chelating aromatic diimine ligands
    (2007)
    Auzias, Mathieu
    ;
    Therrien, Bruno 
    ;
    Süss-Fink, Georg 
    ;
    Štěpnička, Petr
    ;
    Ludvík, Jiří
    The dinuclear bis(ferrocenecarboxylato) complex Ru2 (CO)4 (μ-OOCFc)2 (py)2 (Fc = ferrocenyl, py = pyridine) was found to react with aromatic diimines (2,2′-dipyridyl, 4,4′-dimethyl-2,2′-dipyridyl, 1,10-phenanthroline, 5-nitro-1,10-phenanthroline, and 5-amino-1,10-phenanthroline) in methanol to give the cationic diruthenium complexes [(N∩N)2Ru2 (CO)2 (μ-CO)2(μ-OOCFc)]+ (1: N∩N = 2,2′-dipyridyl, 2: N∩N = 4,4′-dimethyl-2,2′-dipyridyl, 3: N∩N = 1,10-phenanthroline, 4: N∩N = 5-nitro-1,10-phenanthroline, 5: N∩N = 5-amino-1,10-phenanthroline), which have been isolated as the hexafluorophosphate salts. The molecular structure of 3, solved by single-crystal X-ray analysis of the tetraphenylborate salt [3][BPh4], shows a diruthenium backbone bridged by two carbonyl and by one ferrocenecarboxylato ligand, the two 1,10-phenanthroline ligands being in the axial positions. Cyclic voltammetry in dichloromethane reveals for all compounds two successive oxidations due to ferrocene/ferrocenium redox couple and oxidation of the diruthenium core.
  • Publication
    Accès libre
    Dinuclear ruthenium sawhorse-type complexes containing bridging ligands with ferrocenyl substituents in endo/endo, endo/exo and exo/exo orientations
    (2006)
    Auzias, Mathieu
    ;
    Therrien, Bruno 
    ;
    Labat, Gaël
    ;
    Stoeckli-Evans, Helen 
    ;
    Süss-Fink, Georg 
    The dinuclear ruthenium complexes Ru2(CO)4(OOCC5H4FeC5H5)2L2 (L = NC5H5: 1, L = PPh3: 2) have been synthesized from Ru3(CO)12, ferrocene carboxylic acid and pyridine or triphenylphosphine, respectively. The single-crystal X-ray structure analysis reveals for 1 and 2 a Ru2(CO)4 sawhorse backbone with the two ferrocenyl substituents of the two carboxylato bridges being endo/exo with respect to each other in the solid state. With the new pyridine derivative NC5H4OOCC5H4FeC5H5 (4-ferrocenoyl pyridine) (3) as axial ligand, the complex Ru2(CO)4(OOCC5H4FeC5H5)2(NC5H4OOCC5H4FeC5H5)2 (4) was obtained, the single crystal X-ray structure analysis showing an exo/exo orientation of the two carboxylato bridges in the solid state. The endo/endo orientation is found in the solid-state structure of Ru2(CO)4(HNOCC5H4FeC5H5)2(PPh3)2 (5), the two OCNH bridges being transoïd with respect to each other; this complex is accessible from Ru3(CO)12, ferrocenamide and triphenylphosphine.