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- W2019980491 endingPage "4350" @default.
- W2019980491 startingPage "4350" @default.
- W2019980491 abstract "Emission spectroscopy has been used for the first time in a spectroscopic study of a family of uranium(IV) halide complexes in non-aqueous media. The room temperature electronic absorption spectra of the simple coordination compounds [Li(THF)4][UX5(THF)] (X = Cl, Br, I), [Et4N]2[UCl6] and UCl4 in THF have been recorded and all transitions assigned with the aid of a comprehensive computational study using CASSCF and CASPT2 techniques. Excitation into a band of f-d and LMCT character followed by energy transfer into the 5f-orbital manifold accounts for the UV-visible radiative transitions observed in the emission spectra, which have been fully assigned as arising from transitions from the 5f16d1 electronic configuration to envelopes of states arising from the ground state 5f2 configuration. The bonding in [Li(THF)4][UCl5(THF)] has been further elucidated utilising NBO and AIM calculations which describe the nature of the U–Cl bond as predominantly ionic with some dative covalent character and substantial overlap between the Cl 3p orbitals and 5f and 6d orbitals on uranium. These studies indicate that the emission spectral fingerprint of simple U(IV) compounds of Oh, C4v and C2v symmetry are similar and characteristic and may be used as a diagnostic tool to assign U(IV) species in solution and by inference, in the environment, in the presence of [UO2]2+." @default.
- W2019980491 created "2016-06-24" @default.
- W2019980491 creator A5014378883 @default.
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- W2019980491 creator A5044418069 @default.
- W2019980491 creator A5045428627 @default.
- W2019980491 creator A5086578030 @default.
- W2019980491 date "2013-01-01" @default.
- W2019980491 modified "2023-10-10" @default.
- W2019980491 title "Emission spectroscopy of uranium(iv) compounds: a combined synthetic, spectroscopic and computational study" @default.
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