Issue 13, 2013

Emission spectroscopy of uranium(iv) compounds: a combined synthetic, spectroscopic and computational study

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+.

Graphical abstract: Emission spectroscopy of uranium(iv) compounds: a combined synthetic, spectroscopic and computational study

Supplementary files

Article information

Article type
Paper
Submitted
31 Oct 2012
Accepted
17 Jan 2013
First published
23 Jan 2013
This article is Open Access

RSC Adv., 2013,3, 4350-4361

Emission spectroscopy of uranium(IV) compounds: a combined synthetic, spectroscopic and computational study

E. Hashem, A. N. Swinburne, C. Schulzke, R. C. Evans, J. A. Platts, A. Kerridge, L. S. Natrajan and R. J. Baker, RSC Adv., 2013, 3, 4350 DOI: 10.1039/C3RA22712J

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