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Stoeckli-Evans, Helen
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Stoeckli-Evans, Helen
Affiliation principale
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helen.stoeckli-evans@unine.ch
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Voici les éléments 1 - 10 sur 14
- PublicationMétadonnées seulementConversion of ethylene into ethylidyne on a mixed-metal cluster: synthesis and structure of IrRu4(CO)(15)(mu(4)-CH3)(1999)
; The thermal reaction of the tetranuclear cluster HIrRu3(CO)(13) with ethylene in hexane (90 degrees C, 2 bar) affords, in addition to H3IrRu3(CO)(12), the pentanuclear cluster HIrRu4(CO)(15)(mu(4)-C-CH3) (1) in which the ethylidyne ligand is coordinated through a carbon atom to the four ruthenium atoms in the IrRu4 core. In this reaction, the CH2=CH2 molecule has been transformed into a C-CH3 moiety coordinated as a mu(4)-ligand to the cluster. (C) 1999 Elsevier Science S.A. All rights reserved. - PublicationMétadonnées seulementMetal-framework degradation reactions of the mixed-metal cluster anions [M3Ir(CO)(13)](-) (M=Ru, Os) with bis(diphenylphosphino)methane and with tricyclohexylphosphine: synthesis and structure of HRu2Ir(CO)(5)(dppm)(3), HRu2Ir(CO)(6)(PCy3)(3), H2Os2Ir2(CO)(10)(PCy3)(2) and H3Os3Ir(CO)(8)(PCy3)(3)(1999)
; - PublicationMétadonnées seulementNew Ru-3(CO)(12) derivatives with bulky diphosphine ligands: synthesis, structure and catalytic potential for olefin hydroformylation(2001)
; The diphosphine clusters Ru-3(CO)(10)(dcpm) (1) and Ru-3(CO)(10)(F-dppe) (2) as well as the bis(diphosphine) clusters Ru-3(CO)(8)(dcpm)(2) (3) and Ru-3(CO)(8)(F-dppe)(2) (4) have been synthesised from Ru-3(CO)(12) and the bulky diphosphines 1,2-bis[bis(pentafluorophenyl)phosphino]ethane (F-dppe) and bis(dicyclohexylphosphino)methane (dcpm). While the single-crystal X-ray structure analyses of 1, 2 and 3 show the expected mu (2)-eta (2) coordination of the diphosphine ligands, that of 4 reveals an unusual structure with one mu (2)-eta (2)-diphosphine and one mu (1)-eta (2)-diphosphine ligand. The clusters 1-4 catalyse the hydroformylation of ethylene and propylene to give the corresponding aldehydes, 2 showing higher activities than those observed for Ru-3(CO)(12) and Ru-3(CO)(10)(dppc). (C) 2001 Elsevier Science Ltd. All rights reserved. - PublicationMétadonnées seulementTriruthenium clusters containing vinyl ligands: synthesis and structure of Ru-3(mu(2)-CO)(2)(CO)(6)[mu(3)-NS)(O)MePh](mu(2)-eta(1),eta(2)-PhCH2C=CH 2), Ru-3(mu(2)-CO)(CO)(7)[mu(3)-NS(O)MePh](mu(3)-eta(1),eta(2)-(PrC)-C-n=CHP rn), Ru-3(mu(2)-CO)(CO)(7)[mu(3)-NS(O)MePh](mu(3)-eta(1),eta(2)-PhC=CHBun), and (mu(2)-H)Ru-3(CO)(6)(mu(2)-eta(1),eta(2)-PhC=CHPh)(mu(3)-eta(1),eta(2)-P hC CPh)[mu(3)-eta(1),eta(2)-NS(O)Me(C6H4)](1997)
; The electron-deficient cluster (mu(2)-H)Ru-3(CO)(9)[mu(3)-NS(O)MePh] (1) reacts with the terminal alkyne PhCH2C=CH to give the vinyl complex Ru-3(mu(2)-CO)(2)(CO)(6)[mu(3)-NS(O)MePh](mu(2)-eta(1),eta(2)-PhCH2C=CH2 ) (2). The analogous reaction with internal alkynes (RC=CR') affords the clusters Ru-3(mu(2)-CO)(CO)(7)[mu(3)-NS(O)MePh](mu(3)-eta(1),eta(2)-RC=CHR') (3: R = R' = Pr "; 4: R = Ph; R' = Bu ") in which the vinyl ligand has opened a Ru-Ru bond upon coordination the Ru-3 framework. In the case of diphenylacetylene, reaction with two equivalents of the alkyne, yields the vinyl-alkyne cluster (mu(2)-H)Ru-3(CO)(6)(mu(2)-eta(1),eta(2)-PhC=CHPh)(mu(3)-eta(1),eta(2)-P hC=CPh)[mu(3)-eta(1),eta(2)-NS(O)Me(C6H4)] (5) with ortho-metallation of the phenyl substituent of the sulfoximido cap. (C) 1997 Elsevier Science S.A. - PublicationMétadonnées seulementReactions of the cationic complex [(eta(6)-C6Me6)(2)Ru-2(mu(2)-H)(3)](+) with nitrogen-containing heterocycles in aqueous solution(1998)
; The dinuclear cation [(eta(6)-C6Me6)(2)Ru-2(mu(2)-H)(3)](+) (1) reacts in aqueous solution with pyrazole and 4-methylpyrazole to give the bispyrazolato complexes [(eta(6)-C6Me6)(2)Ru-2(mu(2)-H)(mu(2)-eta(1),eta(1)-N2C3H2R)(2)](+) (R = H: 2, R = Me: 3). The reaction with 1,2,4-triazole results in the formation of the bistriazolato complex [(eta(6)-C6Me6)(2)Ru-2(mu(2)-H)(mu(2)-eta(1),eta(1)-N3C2H2)(2)](+) (4) Successive protonation of the triazolato ligands in 4 leads to the complexes [(eta(6)-C6Me6)(2)Ru-2(mu(2)-H)(mu(2)-eta(1),-N3C2H2)(mu(2)-eta(1),eta(1 )-N3C2H3)](2+) (5) and [(eta(6)-C6Me6)(2)RU2(mu(2)-H)(mu(2)-eta(1),eta(1)-N3C2H2)(2)](3+) (6). The reaction of 1 with 1,2,3-triazole gives a 1:1 mixture of the bistriazolato complexes [(eta(6)-C6Me6)(2)Ru-2(mu(2)-H)(mu(2)-eta(1),eta(1)-N3C2H2)(2)](+) with parallel (7a) and anti-parallel (7b) coordination of the triazolato ligands. The single-crystal X-ray structure analyses of 2 (hexafluorophosphate salt) and 4 (tosylate salt) reveal for both complex types a ruthenium-ruthenium backbone being bridged by the two heterocyclic ligands with the N-N axis coordinated in a mu(2)-eta(1),eta(1)-fashion. A single-crystal X-ray structure analysis of title complex 1 (hexafluorophosphate salt) confirms the presence of three bridging hydride ligands with a Ru-Ru distance of only 2.47 Angstrom. (C) 1998 Elsevier Science S.A. All rights reserved. - PublicationMétadonnées seulementRu-4(mu-CO)(CO)(9)(eta(4)-mu(4)-C6H4)(eta(2)-mu(1), mu(4)-PPhCH2CH2PPh2): an unusual pyrolysis product of Ru-3(CO)(10)(dppe) containing a benzyne ligand(2002)
; The thermal decomposition of Ru-3(CO)(10)(dppe) in refluxing benzene gives, in contrast to the pyrolysis of the dppm analogue, the tetranuclear cluster Ru-4(mu-CO)(CO)(9)(eta(4)-mu(4)-C6H4) (eta(2)-mu(1), mu(4)-PCH2CH2PPh2) (1) along with Ru-3 (CO)(9)(eta(2)-mu(1), mu(2)-C6H5)(eta(3)-mu(1), mu(2)-PPhCH2CH2PPb2) (2). The single-crystal structure analysis of 1 reveals a square-planar tetraruthenium skeleton containing a eta(4)-mu(4)-benzyne ligand as well as a eta(2)-mu(1), mu(4)-phosphinidene-phosphine ligand. (C) 2002 Elsevier Science B.V. All rights reserved. - PublicationMétadonnées seulementCarbon-carbon coupling reactions on triruthenium clusters: synthesis and structure of Ru-3(CO)(9)[mu(3)-eta(3)-PhCCCC(H)Ph][mu(2)-NS(O)MePh] and Ru-3(mu(2)-CO)(CO)(7)[mu(3)-eta(3)-PhCCCC(H)Ph][mu(3)-NS(O)MePh](1997)
; The reaction of the electron-deficient cluster (mu(2)-H)Ru-3(CO)(9)[mu(3)-NS(O)MePh] (1) with para-nitrotolane gives, with coupling of two alkyne units and elimination of the para-nitrophenyl fragment, the trinuclear complexes Ru-3(CO)(9)[mu(3)-eta(3)-PhCCCC(H)Ph][mu(2)-NS(O)MePh] (2) and Ru-3(mu(2)-CO)(CO)(7)[mu(3)-eta(3)-PhCCCC(H)Ph][mu(3)-NS(O)MePh] (3). The resulting organic moiety, coordinated as mu(3)-eta(3)-5e-donor, is best considered as a butenynyl (PhC=C-C=C(H)Ph) ligand in 2 and as a butatrienyl (PhC=C=C=C(H)Ph) ligand in 3. From the reaction mixture, the two isomeric vinyl complexes Ru-3(mu(2)-CO)(2)(CO)(6)[mu(2)-eta(2)-PhC=C(H)(C6H4-p-NO2)][mu(3)-NS(O)M ePh] (4a) and Ru-3(mu(2)-CO)(2)(CO)(6)[mu(2)-eta(2)-(C6H4-P-NO2)-C=C(H)Ph]-[mu(3)-NS(O )MePh] (4b) complexes can also be isolated. (C) 1997 Elsevier Science S.A. - PublicationMétadonnées seulementTri- and tetranuclear mixed-metal clusters containing alkyne ligands: Synthesis and structure of [Ru3Ir(CO)(11)(RCCR ')](-), [Ru2Ir(CO)(9)(RCCR ')](-), and [HRu2Ir(CO)(9)(RCCR ')](1999)
; - PublicationMétadonnées seulementThe cluster dication [H6Ru4(C6H6)(4)](2+) revisited: the first cluster complex containing an intact dihydrogen ligand?(2000)
; ; - PublicationMétadonnées seulementFixation of triruthenium clusters on melamine: synthesis and structure of [Ru-3(mu(2)-H)(CO)(9){mu(3),eta(2)-NHC3N3(NH2)(2)}], cis-[{Ru-3(mu(2)-H)(CO)(9)}(2){mu(3),eta(2):mu(3),eta(2)-NHC3N3(NH2)}] and trans-[{Ru-3(mu(2)-H)(CO)(9)}(2){mu(3),eta(2):mu(3),eta(2)-NHC3N3(NH2)}](1998)
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