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- Title
Synthesis and Characterization of a Uranium(II) Monoarene Complex Supported by δ Backbonding.
- Authors
La Pierre, Henry S.; Scheurer, Andreas; Heinemann, Frank W.; Hieringer, Wolfgang; Meyer, Karsten
- Abstract
The low-temperature (<−35 °C) reduction of the trivalent uranium monoarene complex [{(Ad,MeArO)3mes}U] ( 1), with potassium spheres in the presence of a slight excess of 2.2.2-cryptand, affords the quantitative conversion of 1 into the uranium(II) monoarene complex [K(2.2.2-crypt)][((Ad,MeArO)3mes)U] ( 1-K). The molecular and electronic structure of 1-K was established experimentally by single-crystal X-ray diffraction, variable-temperature 1H NMR and X-band EPR spectroscopy, solution-state and solid-state magnetism studies, and optical absorption spectroscopy. The electronic structure of the complex was further investigated by DFT calculations. The complete body of evidence confirms that 1-K is a uranium(II) monoarene complex with a 5f 4 electronic configuration supported by δ backbonding and that the nearly reversible, room-temperature reduction observed for 1 at −2.495 V vs. Fc/Fc+ is principally metal-centered.
- Subjects
URANIUM compounds synthesis; AROMATIC compounds; COMPLEX compounds; LOW temperatures; CHEMICAL reduction
- Publication
Angewandte Chemie, 2014, Vol 126, Issue 28, p7286
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201402050