6533b7d0fe1ef96bd125b6ae

RESEARCH PRODUCT

Metallatomsynthese, Eigenschaften und Struktur von μ 2 ‐(η 3 ,η 3 ‐Toluol)bis[(η 6 ‐toluol)eisen](Fe‐Fe)

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Metal Atom Synthesis, Properties, and Structure of μ2(η3,η3-Toluene)bis[(η6-toluene)iron](Fe-Fe) Metal atom cocondensation of iron atoms and toluene produces the mononuclear iron sandwich compound [(η6-toluene)(η4-toluene)Fe] 1. Complex 1 reacts with a palette of N-containing ligands such as primary, secondary, and tertiary amines as well as pyridine, pyrrolidine, and tmeda to form highly reactive instable intermediates. In the temperature range from -80 to -30°C, the proposed intermediates react with toluene to form the first homoleptic Fe/toluene complex μ2-(η3η3-toluene)-bis[(η6-toluene)iron](Fe-Fe) (3) regardless which N-containing ligand is used. Additionally, 3 is also formed when ethanol is used instead of N-containing base ligands. Black thermolabile 3 was characterized by low-temperature 1H-, 13C-, and Moβbauer spectroscopy as well as by an X-ray structure analysis (-173°C). The X-ray structure determination reveals a μ-η3η3-briding toluene ligand capping two {(η6-toluene)Fe} units which are connected by an Fe-Fe bond [2.746(1) A]. However, in solution up to -30°C all three toluene ligands are fluxional according to 1H- and 13C-NMR data. At -10°C 3 reacts with CO with decomposition to form Fe metal. With 2,2-bipyridine and ethene no reaction is observed up to room temperature.