Über Reaktionen oxygenierter Kobalt(II)-Chelate. II. Konfigurationsisomere Oxygenierungsprodukte von Tetraäthylenpentaminkobalt(II) |
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Authors: | Margareta Zehnder Silvio Fallab |
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Abstract: | On oxygenation of alcoholic solutions of tetraethylenepentamine cobalt(II) two isomeric forms of (tetren)CoO2Co(tetren)]4+ are obtained in which the configuration of the pentadentate ligand is either α or β. The binuclear complex can be crystallized as thiocyanate or as perchlorate. Oxygenation at 35° produces the pure α isomer. At lower temperature a mixture of α and β is obtained. The isomers differ slightly in their absorption spectra and their reactivity. The ligand configuration has been elucidated by transforming the perchlorates into the ZnCl4]2? salts of the corresponding mononuclear chelates Co(tetren)Cl]2+. The latter have also been prepared starting from a compound of known configuration according to the literature. The IR. spectra of the α and β forms differ characteristically in the NH stretch bands. |
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