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• W2052256842 abstract "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′ReH 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. Der Hexahydrido-Rheniumkomplex (η5-C5Me5)ReH6 (1) wurde durch Gasphasen-Elektronenbeugung (Oslo), sein Derivat (η5-C5Me4Et)ReH6 (1′) durch Einkristall-Röntgenbeugung bei 23°C (München) strukturchemisch definiert. In Bestätigung eines aus NMR-Daten resultierenden Strukturvorschlags liegt die seltene pentagonal-bipyramidale Geometrie mit fünf equatorialen Hydrid-Liganden vor, die in 140–166 pm (Röntgenbeugung) bzw. in 166.5(14) pm Abstand (Elektronenbeugung) vom Metallatom gefunden werden. Der große Raumanspruch der (zentral π-gebundenen) Ringliganden erklärt die regenschirmartige Struktur der H′ReH5-Gruppe (Winkel H′ReH 66–70°; Röntgenbeugung). Chemische und strukturchemische Argumente sprechen eher für hydridische als für protische H-Liganden. Die unabhängig voneinander ermittelten Strukturdaten in der Gasphase und im Kristall sind in voller Übereinstimmung mit den NMR-Spektren in Lösung: Nach T1-Messungen liegen η1-gebundene H-Liganden vor." @default.
• W2052256842 created "2016-06-24" @default.
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• W2052256842 date "1990-09-01" @default.
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• W2052256842 title "Gasphasen- und Kristall-Struktur sowie Reaktionen von Hexahydrido(η5-pentamethylcyclopentadienyl)rhenium(VII), (η5-C5Me5)ReH6: Elektronen- und Röntgenbeugung" @default.
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• W2052256842 doi "https://doi.org/10.1016/0022-328x(90)85263-x" @default.
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