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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: Multiple Bonds Between Main Group Elements and Transition Metals, XXVII. Redox Reactions of Chromium-Selenium Triple BondsThe title complex μ-selenido-bis[dicarbonyl(η5-cyclopentadienyl)chromium] (1) reacts with reducing agents such as potassium superoxide and cobaltocene to yield novel mono- and multinuclear ionic complexes. Thus, compound 5 results from treatment of 1 with KO2 in the presence of [2.2.2]-cryptand in a solution of acetone; 5 contains the mononuclear complex anion [(η5-C5H5)Cr(CO)2(η2-Se2)]- (X-ray structure). In the reaction with cobaltocene, conducted in tetrahydrofuran/diethyl ether solution at -30°C, 1 is converted into the extremely oxygen-sensitive ionic compound 2 which, for the first time, reveals an organometallic species containing a planar Cr3Se-multiple bond system (X-Ray structure); 2 decomposes at room temperature to give both the tetrameric selenium complex 3 of composition [(C5H5)CrSe]4 (Cr4Se4 cubane-type structure) and the ionic compound [Co-(η5-C5H5)2]+ [(η5-C5H5)Cr(CO)3]- (4; X-Ray structure).
    Notes: Der Titelkomplex μ-Selenido-bis[dicarbonyl(η5-cyclopentadienyl)chrom] (1) reagiert mit Reduktionsmitteln wie Kaliumsuperoxid oder Cobaltocen zu neuartigen ein- und mehrkernigen Komplexsalzen. So ergibt KO2 in Gegenwart von [2.2.2]-Kryptand in Aceton-Lösung bei Raumtemperatur das Komplexsalz 5, welches das einkernige Komplexanion [(η5-C5H5)Cr(CO)2(η2-Se2)]- enthält (Röntgenstrukturanalyse). Mit Cobaltocen ergibt 1 bei -30°C in Tetrahydrofuran/Diethylether-Lösung das extrem sauerstoffempfindliche Komplexsalz 2, in dem erstmals eine Organometall-Spezies mit planarem Cr3Se-Mehrfachbindungssystem vorliegt (Röntgenstrukturanalyse). 2 zerfällt bei Raumtemperatur unter Bildung des tetrameren Selen-Komplexes 3 der Zusammensetzung [(C5H5)CrSe]4 (Cr4Se4-Cubanstruktur) und in den salzartigen Komplex [Co(η5-C5H5)2]+[(η5-C5H5)Cr(CO)3]- (4; Röntgenstrukturanalyse).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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