Title :

Investigation of the luminescence of [UO₂X₄]^2- (X=Cl, Br) complexes in organic phase using time-resolved laser-induced fluorescence spectroscopy and quantum chemical simulations

Author(s) :

Oher, Hanna [Auteur]
Vercouter, Thomas [Auteur correspondant]
Réal, Florent [Auteur]
Physico-Chimie Moléculaire Théorique [PCMT]
Vallet, Valérie [Auteur correspondant]
Physico-Chimie Moléculaire Théorique [PCMT]

Journal title :

Inorganic Chemistry

Pages :

5896-5906

Publisher :

American Chemical Society

Publication date :

2020

ISSN :

0020-1669

HAL domain(s) :

Chimie/Chimie théorique et/ou physique
Physique [physics]/Physique [physics]/Chimie-Physique [physics.chem-ph]
Chimie/Chimie de coordination

English abstract : [en]

The luminescence properties of the [UO₂Cl₄]^2- complex in an organic phase, especially the influence of large organic counter cations, have been studied by time-resolved laser-induced ...
Show more >The luminescence properties of the [UO₂Cl₄]^2- complex in an organic phase, especially the influence of large organic counter cations, have been studied by time-resolved laser-induced fluorescence spectroscopy (TRLFS) and ab initio modeling. The experimental spectrum was assigned by vibronic Franck-Condon calculations on quantum chemical methods on the basis of a combination of relativistic density functional approaches. The shape of the luminescence spectrum of the uranyl tetrachloride complex is determined by symmetrical vibrations and geometrical change upon emission. The possible change in the luminescence properties depending on the first and second uranyl coordination spheres was predicted theoretically for the [UO₂Br₄]^2- and [R₄N]₂[UO₂Cl₄] ([R₄N] = [Bu₄N], [A336]) systems. The computations reveal that for U(VI), the second coordination sphere has little influence on the spectrum shape, making speciation of uranyl complexes with identical first coordination-sphere ligands tedious to discriminate. The computed structural changes agreed well with experimental trends; theoretical spectra and peak attributions are in a good accordance with TRLFS and magnetic circular dichroism (MCD) data respectively.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

ANR Project :

Physiques et Chimie de l'Environnement Atmosphérique
ULNE

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL