Synthesis and chemical reactivity of an Fe(III) metallacrown-6 towards N-donor Lewis bases |
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| Affiliation: | 1. Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Technical University of Lisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;2. Universidade Lusófona de Humanidades e Tecnologias, ULHT Lisbon, Campo Grande 376, 1749-024, Lisboa, Portugal;1. Forschungs-Neutronenquelle Heinz Maier-Leibnitz, TU München, Lichtenbergstraße 1, 85748 Garching;2. Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Str. 4, 35032 Marburg |
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| Abstract: | The iron(III) 18-azametallacrown-6 Fe(ashz)(EtOH)]6 (1) (ashz3 ? = trianionic derivative of N-acetylsalicylhydrazide), prepared upon reaction of Fe3(μ3-O)(Piv)6(H2O)3](Piv) (Piv = ButCOO?) with H3ashz, reacts with N-heterocyclic Lewis bases (B = pyridine, 4-methyl pyridine, 3-amino pyridine or imidazole), leading to the stable adducts Fe(ashz)(B)]6 (2 to 5, respectively) upon replacement of the labile ethanol ligand. All the compounds were characterized by elemental analysis, IR and ESI–mass spectroscopies and, for complexes 1 and the 3-amino pyridine adduct 4, also by X-ray crystallography. In both 1 and 4, the stereochemistry of the ligand imposes a propeller configuration of the metal cation which exhibits alternating Λ/Δ forms. |
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