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Digitale Medien

Azoalkan- und Nitren-verbrückte Carbonylmetall-Cluster des Eisens und Rutheniums (1991)

Hansert, Bernhard ; Powell, Anne K. ; Vahrenkamp, Heinrich

Weinheim : Wiley-Blackwell

Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2697-2704

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ISSN: 0009-2940

Schlagwort(e): Clusters, trinuclear and tetranuclear ; Iron clusters ; Ruthenium clusters ; Azoalkane and nitrene bridging ; Chemistry ; Inorganic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Azoalkane- und Nitrene-Bridged Carbonyl Metal Clusters of Iron and RutheniumBy using cluster buildup reactions, the new azoalkane-bridged clusters Ru3(CO)9(RN=NR) (3a, R=Me, 3b, R=Et), Fe2Ru(CO)9(EtN=NEt) (4), Ru4(CO)12(RN=NR) (5a, R=Me, 5b, R=Et), and FeRu3(CO)12(EtN=NEt) (6) were obtained. Upon attempts to prepare further such compounds, the N-N bond was cleaved resulting in nitrene-bridged clusters including the new compound Fe4(CO)11(μ4-NEt)2 (9). Cluster buildup starting from Ru3(CO)9(μ3-NPh)2 resulted in Ru4(CO)11(μ4-NPh)2 (10) and FeRu3(CO)11(μ4-NPh)2 (11). The crystal structures of 5b and 9 as well as some reactions of the nitrene-bridged clusters are described.

Zusätzliches Material: 8 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/cber.19911241210

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Digitale Medien

Derivatchemie des Clusters Ru4(CO)12(μ4-η2-N2Et2) (1993)

Hansert, Bernhard ; Vahrenkamp, Heinrich

Weinheim : Wiley-Blackwell

Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2023-2026

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ISSN: 0009-2940

Schlagwort(e): Ruthenium clusters ; Azoalkane ligands ; Hydrogenation ; Oxidation and reduction ; Alkyne addition ; Chemistry ; Inorganic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Derivative Chemistry of the Cluster Ru4(CO)12(μ4η2-N2Et2)The title compound (1) can be converted into H2Ru4CO)11(μ4-η2-N2Et2) (2) in three ways: a) by direct hydrogenation, b) by a H - /H+ sequence, c) by reduction with Na/Hg (reversible with FeCp2+/CO) and subsequent protonation. The structure of 2 has been determined by an X-ray analysis. 2 is a dibasic acid and shows ligand fluxionality as demonstrated by NMR. 2 adds phenylacetylene either by insertion into one Ru - H bond or by H2 replacement yielding HRu4(CO)10(μ4-N2Et2)(μ-CPh≡CH2) (3) or Ru4(CO11(μ4-N2Et2)(μ4-HCCPh) (4).

Zusätzliches Material: 1 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/cber.19931260909

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Digitale Medien

Umwandlungen zwischen Ru3-fixierten Azoalkan- und Dialkylhydrazin-Baueinheiten (1993)

Hansert, Bernhard ; Vahrenkamp, Heinrich

Weinheim : Wiley-Blackwell

Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2011-2016

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ISSN: 0009-2940

Schlagwort(e): Ruthenium clusters ; Azoalkane ligands ; Hydrazine-derived ligands ; Interconversions ; Chemistry ; Inorganic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Interconversions Between Ru3-Bound Azoalkane and Dialkylhydrazine-Derived Building UnitsReactions involving hydrogen transfer have been investigated starting from the azoalkane-bridged clusters Ru3(CO)9-(RCH2N≡NCH2R) (1a, R = H; 1b, R = Me). In boiling toluene they are isomerized to the hydrazonide-bridged clusters HRu3(CO)9(RCH2N - N≡CHR) (2a, R = H; 2b, R = Me). Pd/C-catalyzed hydrogenation converts both compound types into the hydrazide-bridged clusters HRu3(CO)9(RCH2N - NHCH2R) (3a, R = H; 3b, R = Me). Hydride attachment to 1 and 2 and deprotonation of 3 yield a common anionic intermediate 4 which is converted into 3 upon protonation. While deuteration experiments and NMR spectra indicate that the anionic intermediate equilibrates between the N - H and Ru - H isomers, aurations of deprotonated clusters with Ph3PAuCl yield the Ru - Au-connected clusters Ph3PAuRu3(CO)9(EtN - N≡CHMe) (5) and Ph3PAuRu3(CO)9(MeN - NHMe) (6). The reversible cluster expansion of 2b with Fe(CO)3 fragments which results in the formation of FeRu3(CO)12(μ4-η2-N2Et2) (7) involves a reversible reconversion of the hydrazonide ligand to the azoalkane ligand.

Zusätzliches Material: 3 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/cber.19931260907

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Digitale Medien

Reaktionen der Hydrazid-verbrückten Cluster HRu3(CO)9(RN - NR2) mit Alkinen (1993)

Hansert, Bernhard ; Vahrenkamp, Heinrich

Weinheim : Wiley-Blackwell

Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2017-2022

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ISSN: 0009-2940

Schlagwort(e): Hydrazide ligands ; Vinyl ligands ; Alkyne insertions ; Ruthenium clusters ; Structure determinations ; Chemistry ; Inorganic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Reactions of the Hydrazide-Bridged Clusters HRu3(CO)9(RN - NR2) with AlkynesThe clusters HRu3(CO)9(RN - NR2) (1) with triply bridging hydrazide ligands (RN - NR2 = MeN - NHMe, HN - NHMe, HN - NMe2) undergo reactions with the alkynes HCCPh and PhCCPh to yield three cluster products in each case. One of them (2) is presumed to result from Ru - H insertion with concomitant cluster opening. The second (3) contains an open Ru3 cluster bridged by a unique μ3-η2-vinyl ligand, as shown by a structure determination. The third (4) represents the expected simple reaction product with a s̰,-bound vinyl ligand, again proved by a structure determination. Cluster type 3 is converted to cluster type 2 by CO addition.

Zusätzliches Material: 6 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/cber.19931260908

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Digitale Medien

A Systematic Entry to Butterfly-Type [M4(CO)12(μ4-XY)] ClustersThis work was supported by the Stiftung Volkswagenwerk, the Fonds der Chemischen Industrie and the Rechezentrum der Universität Freiburg.Dedicated to Professor Christoph Rüchardt on the occasion of his 60th birthday (1989)

Bantel, Harald ; Hansert, Bernhard ; Powell, Anne K. ; [weitere]

Weinheim : Wiley-Blackwell

Angewandte Chemie International Edition in English 28 (1989), S. 1059-1060

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ISSN: 0570-0833

Schlagwort(e): Chemistry ; General Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/anie.198910591

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