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- W1567114750 abstract "The reaction products of U(η-C5H5)2(NEt2)2 with β-diketones depend on temperature. At low temperature (-20°C) with stoichiometric amounts of β-diketone, the compounds U(η-C5H5)2(β-diketonato)2 (II) are obtained as the major products. At higher temperature, or in the presence of an excess of β-diketone, loss of a cyclopentadienyl ligand occurs and the compounds U(η-C5H5)(β-diketonato)3 (III) are isolated. The low temperature PMR spectra are consistent with “cis” octahedral coordination geometry around the metal atom in II, and with the geometry of a pentagonal bipyramid (C5 symmetry) in III. Les produits de la réaction de U(η-C5H5)2(NEt2)2 avec les β-dicétones dépendent de la température. A basse température (-20°C) et en présence de quantités stoechiométriques de β-dicétones, les composés U(η-C5H5)2(β-dicétonato)2 (II) sont normalement isolés comme produits majoritaires. A température plus élevée, ou en présence d'un excès de β-dicétone, ii y a départ d'un ligande cyclopentadiényle et on isole les composés U(η-C5H5)(β-dicétonato)3 (III). La RMN protonique à basse température est compatible avec une structure octaédrique “cis” pour II tandis que la géométrie de III correspond à une bipyramide pentagonale de symétrie C5." @default.
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- W1567114750 date "1982-01-01" @default.
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- W1567114750 title "Complexes cyclopentadienyles de l'uranium(IV)" @default.
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- W1567114750 doi "https://doi.org/10.1016/s0022-328x(00)85837-4" @default.
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