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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure Reactivity Correlations in Coordinatively Unsaturated Chelate Complexes. VIII. New Iron(II) Complexes of Tridentate Di-anionic Schiff Base Ligands with [NO2]-Donor SetThe synthesis of new iron(II) complexes of the type 3 is described. The complexes have been isolated as red or reddish brown adducts with the solvent (MeOH) and with additional bases (NH3, pyridine), respectively. The compounds are extremely sensitive to air. All of them are high spin complexes. In absence of oxygen, the adducts cannot be converted into the solvent-free complexes by thermal treatment without decomposition of the chelate ligand. In the presence of moist air, however, the solvent molecules are removed quickly at room temperature. The oxidation results in black products which seem to be hydroxo (3a, 3b) or dinuclear μ-oxo (3c, 3d, 3f) iron(III) derivatives. Their reduced magnetic moments (3,2 … 4,5 μb) point to antiferromagnetic interactions. The iron(II) complexes react with iodine to form black 1:1 derivatives which exhibit a slightly reduced paramagnetism.
    Notes: Die Synthese neuer Eisen(II)-Komplexe des Typs 3 wird beschrieben. Die Komplexe wurden als rote oder rötlich-braune Addukte mit dem Lösungsmittel (MeOH) bzw. mit zusätzlichen Basen (NH3, Pyridin) isoliert. Die Verbindungen sind extrem luftempfindlich. Alle sind high-spin-Komplexe. In Abwesenheit von Sauerstoff lassen sich die Addukte nicht durch thermischen Abbau ohne Zersetzung des Chelatliganden in solvensfreie Formen überführen. In Gegenwart von feuchter Luft werden die Solvensmolekeln dagegen rasch abgebaut. Die Oxydation führt zu schwarzen Produkten, die Hydroxo- (3a, 3b) oder dinucleare μ-Oxo- (3c, 3d, 3f) -eisen(III)-Derivate zu sein scheinen. Ihre reduzierten magnetischen Momente (3,2 … 4,5 μb) deuten auf antiferromagnetische Wechselwirkungen hin. Die Eisen(II)-Komplexe reagieren mit Iod zu schwarzen 1:1-Derivaten, die leicht reduzierten Paramagnetismus zeigen.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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