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Süss-Fink, Georg
Nom
Süss-Fink, Georg
Affiliation principale
Fonction
Professeur ordinaire
Email
georg.suess-fink@unine.ch
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Résultat de la recherche
Voici les éléments 1 - 10 sur 19
- PublicationMétadonnées seulementMesomorphic Metallo-Dendrimers Based on the Metal-Metal Bonded Ru2(CO)4 Sawhorse Unit(2008)
; - PublicationMétadonnées seulementSynthesis and characterization of tetrahedral Ru3O clusters with intrinsic framework chirality: a chiral probe of the intact cluster catalysis concept. [Erratum to document cited in CA144:088385](2006)
; ; ; - PublicationMétadonnées seulementSynthesis and Characterization of Tetrahedral Ru3O Clusters with Intrinsic Framework Chirality: A Chiral Probe of the Intact Cluster Catalysis Concept(2005)
; ; ; - PublicationMétadonnées seulementSupramolecular triruthenium cluster-based benzene hydrogenation catalysis: Fact or fiction?(2005)
; Finke, Richard GThe question is addressed of whether the triruthenium cluster cation [Ru-3(mu(2)-H)(3)(eta(6)C(6)H(6))(eta(6)-C6Me6)(2)(mu(3)-O)](+), 1, is a supramolecular, outer-sphere benzene hydrogenation catalyst or is 1 a precatalyst to well-known Ru(0)(n) catalysis of benzene hydrogenation. This question of "is it homogeneous or heterogeneous catalysis?" is especially important in the present case since if 1 is a supramolecular, homogeneous catalyst as postulated in the literature that is, if 1 can in fact accomplish catalysis of reactions as difficult as benzene reduction with no inner-sphere, d-orbital-mediated ligand dissociation, oxidative addition, migratory insertion, or reductive elimination-then that finding holds promise of rewriting the rules of organometallic-based catalysis. The identity of the true catalyst derived from 1 is, therefore, addressed by a collaborative effort between research groups at the Universite de Neuchatel and Colorado State University. The methodology employed is that worked out previously for addressing the historically vexing question of "is it homogeneous or heterogeneous catalysis?" (Lin, Y.; Finke, R. G. Inorg. Chem. 1994, 33, 489 1). A combination of the following classes of experiments have been employed: (i) Ru metal product studies; (ii) kinetic studies; (iii) Hg(0) and quantitative poisoning experiments, (iv) NMR studies of H/D exchange rates; (v) other data, plus (vi) the principle that the correct mechanism will explain all of the data. The results provide a compelling case that 1 is not the true benzene hydrogenation catalyst as previously believed; instead, all our evidence is consistent with, and supportive of, trace Ru(0) derived from 1 under the reaction conditions as the true, active catalyst. Nine additional conclusions are also presented as part of the summary and take-home messages, as well as a citation of "Halpern's rules" for catalysis. - PublicationMétadonnées seulementAn unsymmetrical trihydrido-bridged arene ruthenium complex(2004)
; Reaction of [Ru(?6-indan)(H2O)3]2+ and [Ru(?6-C6Me6)(H2O)3]2+ with NaBH4 in water gives a mixt. of three triple hydrido-bridged arene ruthenium cations [(?6-arene)Ru(?-H)3Ru(?6-arene')]+ (arene = indan and hexamethylbenzene; arene' = indan and hexamethylbenzene). After treatment with NaBF4, the three complexes are sepd. by column chromatog. and the unsym. cation [(?6-indan)Ru(?-H)3Ru(?6-C6Me6)][BF4] can be isolated in moderate yield. This cation decomps. in soln. to give the corresponding hydroxo-bridged complex [(?6-indan)Ru(?-OH)3Ru(?6-C6Me6)]+ with retention of the unsym. geometry as shown by single-crystal X-ray anal. The indan ligand adopts an envelope conformation toward the ruthenium atom. [on SciFinder(R)] - PublicationMétadonnées seulementSynthesis 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)
; Benzoic acid 2-cyclohexa-1,4-dienyl Et ester (1), and 4-phenylbutyric acid 2-cyclohexa-1,4-dienyl Et ester (2) are prepd. by reacting, resp., benzoic acid and 4-phenylbutyric acid with 2-cyclohexa-1,4-dienyl ethanol. These dienyl ester derivs. react with RuCl3·nH2O 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). 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 synthesized 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, resp., from 3 and 4 in aq. soln. The water-sol. trinuclear cluster cations 5 and 6 possess a Ph substituent attached 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 detd. [on SciFinder(R)] - PublicationMétadonnées seulementSupramolecular cluster catalysis: facts and problems(2004)
; ; - PublicationMétadonnées seulement2,3,4,7-Tetrahydro-1H-inden-2-ol: synthesis, molecular structure and coordination chemistry(2004)
; 2,3,4,7-Tetrahydro-1H-inden-2-ol (1) has been synthesized by Birch redn. of indan-2-ol. A single-crystal x-ray structure anal. of 1 shows the compd. to exist as hydrogen-bonded polymers along the c-axis due to the presence of a series of hydrogen-bonds between hydroxo functions. The ferrocene ester derivs., ferrocene carboxylic acid 2,3,4,7-tetrahydro-1H-inden-2-yl ester (2) and ferrocene carboxylic acid indan-2-yl ester (3) have been prepd. by peptidic coupling of ferrocene carboxylic acid with 1 and with indan-2-ol, resp. The single-crystal x-ray structure anal. of 2 and 3 reveal in both cases the cyclopentadienyl rings to adopt an eclipsed conformation with the indenyl substituent being rotated out of the Cp ester plane by almost 90°, allowing no efficient interaction between the ?-system of the Cp ring and the indene moiety. The dienyl deriv. 2 reacts with RuCl3 · nH2O in refluxing ethanol to afford [Ru(arene)Cl2]2 (4) (arene = ferrocene carboxylic acid indan-2-yl ester) as a mixt. of isomers. [on SciFinder(R)] - PublicationMétadonnées seulementIsolation 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). [Erratum to document cited in CA140:059771](2004)
; ; Ward, Thomas R.Figure 3 appeared twice and Figure 4 was missing; the cor. Figure 4 is given. [on SciFinder(R)] - PublicationMétadonnées seulement[?6-2-(2-Methylbenzoyloxy)ethyl methacrylate]bis(?6-1,2,4,5-tetramethylbenzene)tri-?-hydrido-?3-oxo-triruthenium(II)(3 Ru-Ru) tetrafluoroborate(2004)
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