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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mehrfachbindungen zwischen Hauptgruppenelementen und Übergangsmetallen, III Synthese, Einkristall- und Molekülstruktur von μ-Germanium-bis[dicarbonyl(η5-pentamethylcyclopentadienyl)manganl], μ-Ge-[(η5-C5Me5)Mn(CO)2]2Die Titelverbindung 3 wurde nach der Hydrid-Methode durch Behandlung des Solvens-Komplexes (η5-C5Me5)Mn(CO)2(THF) (THF = Tetrahydrofuran) mit Monogerman, GeH4, in Gegenwart von Schwefelsäure synthetisiert. Eine Röntgenstrukturanalysse weist das Vorliegen zweier konformationsisomerer Moleküle im Kristall nach (C/c, monoklin). Bezüglich des streng linearen Mn—Ge—Mn-Gerüsts stehen zwei Carbonyl-Gruppen annähernd auf Deckung, während die anderen beiden anti-Konformation besitzen. Die äquimolar in der Elementarzelle vorlienanden enantiomeren Konformeren leiten sich geometrisch voneinander durch 180°-Drehung einer (η5-C5Me5)Mn(CO)2-Baugruppe um den Mn, Ge, Mn-Vektor ab. Die Mangan  -  Germanium-Bindungslängen betragen 2.18(2) Å (Mittelwert) und weisen damit erheblichen Mehrfachbindungscharakter auf.
    Notes: The title compound 3 has been synthesized along the hydride route by treatment of the solvent complex (η5-C5Me5)Mn(CO)2(THF) (THF = tetrahydrofuran) with monogermane, GeH4, in the presence of sulfuric acid. A single-crystal X-Ray structural analysis revealed two conformers of 3 being present in the solid state in a 1:1 ratio (C2/c, monoclinic). Pairs of carbonyl groups almost eclipse each other, while the remaining two CO ligands an exhibit an anti-conformation relative to the strictly linear Mn—Ge—Mn framework. Both enantiomeric conformers are geometrically related by a 180°-rotation of a (C5Me5)Mn(CO)2 fragment around the Mn, Ge, Mn vector. The manganese  -  germanium bond lenghts average 2.18(2) Å and thus correspond to considerable multiple bonding between these atoms.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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