Luminescence quenching of *[UO2F4]2− in aqueous solutions by anions

Billing, Roland; Захарова, Г. В.; Atabekyan, L. S.; Hennig, H.

doi:10.1016/1010-6030(91)87004-f

Cited by 22 publications

(18 citation statements)

References 50 publications

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“…Prompted by these differing values, we Fig. 4b represents their work) agree with the 6250 sV1 decay rate reported by Billing and coworkers [6] for uranyl in 0.5 M NaF at pH = 7.4 (attributed by them to U02F42-).…”

Section: Resultssupporting

confidence: 75%

“…The much longer luminescence lifetimes observed in the present work and also reported by Moulin and coworkers in 0.67 M HF [7], in comparison with those reported by Moriyasu and coworkers [5] and Billing and coworkers [6], can be understood in terms of uranyl fluoride equilibria that are influenced by whether or not such complexes are electronically excited. If we assume that equilibrium occurs, on the time scale of the observed luminescence, among U02F', U02F2, U02F3-, and U02F42-and F-, for electronicallv excited uranvl species (denoted by an asterisk in equilibrium reactions), we can model the observed data shown in Fig.…”

Section: Resultsmentioning

confidence: 39%

“…They reported that the uranyl luminescence decay rate at 298 K decreased with increasing fluoride concentration to a value, 6667 s-', that remained constant from 0.06 M to 1 M fluoride and concluded that U02F2, U02F3', and U02F: ' have the same luminescence lifetimes. Billing and coworkers reported that the luminescence decay rate of 0.01 M uranyl in 0.5 M NaF at pH 7.4 is 6250 If: 78 s-' and ascribed the luminescence to the U02F: - [6]. During the course of the present investigation, Moulin and coworkers reported that the luminescence decay rate of uranyl in 0.67 M HF is 3333 s-' at 293 K [7] and assigned the luminescence to UOzF3-and U02F42-.…”

Section: Introductionmentioning

confidence: 99%

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Uranyl fluoride luminescence in acidic aqueous solutions

Beitz¹,

Williams²

1997

Journal of Alloys and Compounds

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Luminescence emission spectra and decay rates are reported for uranyl species in acidic aqueous solutions containing HF or added NaF. The longest luminescence lifetime, 0.269 f 0.006 ms, was observed from uranyl in 1 M HF + 1 M HC104 at 296 K and decreased with increasing temperature. Based on a luminescence dynamics model that assumes equilibrium among electronically excited uranyl fluoride species and free fluoride ion, this long lived uranyl luminescence in aqueous solution is attributed primarily to U02F2. Studies on the effect of added LiN03 or Na2W04'2Hz0 showed relatively weak quenching of uranyl fluoride luminescence which suggests that high sensitivity determination of the u F 6 content of w F 6 gas should be feasible via uranyl luminescence analysis of hydrolyzed gas samples of impure w F 6 .

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 39%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Uranyl fluoride luminescence in acidic aqueous solutions

Beitz¹,

Williams²

1997

Journal of Alloys and Compounds

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“…At this pH, the one-electron reduction potential of this species, E ð HC 2 O 4 =HC 2 O À 4 Þ is around 2 V versus NHE [10,12,40,41], and HO radicals coming from Eq. (2) are thermodynamically able to give rise to hydrogen abstraction.…”

Section: Discussionmentioning

confidence: 98%

“…The radical is decomposed to form CO 2 plus the carboxyl anion radical, CO 2 À , a strong reducing agent [40]: 8) or, in the presence of oxygen:…”

Section: Discussionmentioning

confidence: 99%

Oxalic acid destruction at high concentrations by combined heterogeneous photocatalysis and photo-Fenton processes

et al. 2005

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Effects of ligands on excitation energies of [UO₂X₄]²⁻ and UO₂X₂ (X = F, Cl) with the equation‐of‐motion coupled‐cluster theory

Shen

Guo

Wang

et al. 2022

Int J of Quantum Chemistry

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Experimental excitation energies (EEs) of low-lying states for uranyl halides are relatively independent of the type of the equatorial ligands, while many theoretical results indicate that the ligands have a significant effect on the electronic structure of uranyl. In this work, vertical and adiabatic EEs for [UO 2 X 4 ] 2À and UO 2 X 2 (X = F, Cl) are compared at the same computational level, that is, the equation-of-motion coupled-cluster method, to investigate effects of the number and type of ligands on EEs of uranyl. Furthermore, accuracy of a perturbative treatment of spin-orbit coupling (SOC) on EEs of these molecules is also studied. Our results show that reliable EEs are achieved when a sufficient number of spin-free excited states are considered in dealing with SOC perturbatively. Difference between the lowest adiabatic EEs for these molecules is calculated to be within 0.2 eV, which are in reasonable agreement with experimental results. On the other hand, difference between EEs for other higher states of [UO 2 X 4 ] 2À and those of UO 2 X 2 is sizeable. In addition, reasonable EEs can still be obtained when the ligands are replaced by negative point charges.Our results indicate that the number of ligands has a more pronounced effect on EEs of these uranyl chlorides and fluorides than the type of the ligands.

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Luminescence quenching of *[UO2F4]2− in aqueous solutions by anions

Cited by 22 publications

References 50 publications

Uranyl fluoride luminescence in acidic aqueous solutions

Uranyl fluoride luminescence in acidic aqueous solutions

Oxalic acid destruction at high concentrations by combined heterogeneous photocatalysis and photo-Fenton processes

Effects of ligands on excitation energies of [UO₂X₄]²⁻ and UO₂X₂ (X = F, Cl) with the equation‐of‐motion coupled‐cluster theory

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Luminescence quenching of *[UO2F4]2− in aqueous solutions by anions

Cited by 22 publications

References 50 publications

Uranyl fluoride luminescence in acidic aqueous solutions

Uranyl fluoride luminescence in acidic aqueous solutions

Oxalic acid destruction at high concentrations by combined heterogeneous photocatalysis and photo-Fenton processes

Effects of ligands on excitation energies of [UO2X4]2− and UO2X2 (X = F, Cl) with the equation‐of‐motion coupled‐cluster theory

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Product

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Effects of ligands on excitation energies of [UO₂X₄]²⁻ and UO₂X₂ (X = F, Cl) with the equation‐of‐motion coupled‐cluster theory