Gasphasen- und Kristall-Struktur sowie Reaktionen von Hexahydrido(η5-pentamethylcyclopentadienyl)rhenium(VII), (η5-C5Me5)ReH6: Elektronen- und Röntgenbeugung

Wolfgang A. Herrmann, Helmut G. Theiler, Paul Kiprof, Janos Tremmel, Richard Blom

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The hexahydrido rhenium complex (η5-C5Me5)ReH6 (1) has been studied by use of gas-phase electron diffraction (Oslo), while the derivative (η5-C5Me4Et)ReH6 (1′) has structurally been defined by a single-crystal X-ray diffraction study at 23°C (Munich). The data confirm an earlier proposal based on NMR data, that both compounds have the rare pentagonal-bipyramidal geometry, with the five hydrido ligands adopting equatorial positions. The hydrogen-to-rhenium distances are 140-166 pm (X-ray) and 166.5(14) pm (electron diffraction), respectively. The umbrella-type configuration of the H′ReH5 structural unit (angle H′ReH 66-70°; X-ray data) is probably due to the relatively large steric bulk of the (centrically π-bonded) ring ligand. Hydridic rather than protic H-ligands are chemically and structurally in evidence. The structural data obtained independently for the gas-phase and for the crystalline state are consistent with NMR data obtained for solution; the found T,1 values indicates that η1-H- rather than η2-H2 ligands are present.

Original languageGerman
Pages (from-to)69-84
Number of pages16
JournalJournal of Organometallic Chemistry
Issue number1
StatePublished - Sep 18 1990

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