Fluorescence of UO22+ in a non-complexing medium: HClO4/NaClO4 up to 10 M

Billard, Isabelle; Rustenholtz, Anne; Sémon, Laurent; Lützenkirchen, K.

doi:10.1016/s0301-0104(01)00404-9

Cited by 20 publications

(15 citation statements)

References 36 publications

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“…7) have an impact onto the measured lifetimes. In this sense, lifetime measurements provide global information on various interactions occurring in the solution, both on long and short distances [44].…”

Section: Discussionmentioning

confidence: 99%

Photoexcitation of europium(III) in various electrolytes: Dependence of the luminescence lifetime on the type of salts and the ionic strength

Nehlig¹,

Elhabiri²,

Billard³

et al. 2003

Radiochimica Acta

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Europium / Luminescence / Electrolyte / ComplexationSummary. The fluorescence characteristics (lifetime, excitation and emission spectra) of aqueous solutions of Eu(III) containing various supporting electrolytes such as HCl, NaCl, LiCl, CsCl, MgCl 2 , HClO 4 and NaClO 4 have been measured. The observed lifetime variations cannot be properly described neither through the hydration sphere phenomenological approach nor through a Stern-Volmer relationship. Long-range interactions between the excited ion and solvent molecules, in addition to an outer-sphere complexation with the anions, are proposed to account for the observed variations.

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Section: Discussionmentioning

confidence: 99%

Photoexcitation of europium(III) in various electrolytes: Dependence of the luminescence lifetime on the type of salts and the ionic strength

Nehlig¹,

Elhabiri²,

Billard³

et al. 2003

Radiochimica Acta

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“…Examination of Table IV aq and 50µs for the first complex, 28 or 75 or 150 µs for the first two fluoride complexes 27 ) or those indicated in another paper (τ = 300 µs, average value ascribed to the 1 :3 and 1 :4 complexes) 29 do not correspond to the lifetime values given in Table IV aq lifetime is a well-known phenomenon, which has received detailed attention in the case of perchlorate-based supporting electrolytes. 30 It would thus appear reasonable to suppose that a similar effect occurs for uranyl complexes. To our knowledge, this question has never been studied.…”

Section: +mentioning

confidence: 95%

Aqueous Solutions of Uranium(VI) as Studied by Time-Resolved Emission Spectroscopy: A Round-Robin Test

et al. 2003

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Results are presented of an interlaboratory round-robin study of the application of timeResolved Emission Spectroscopy (TRES) to the speciation of uranium(VI) in aqueous media. This involved 13 independent laboratories, using various instrumental adevices and data 2 analysis methods. In some cases, experimental data from a laboratory were analysed using different softwares. Samples were prepared based on appropriate speciation diagrams and in general were found to be chemically stable for at least six months. Four different types of aqueous uranyl solutions were studied: (i) acidic medium where UO 2 2+ aq is the single emitting species, (ii) uranyl in the presence of fluoride ions, (iii) uranyl in the presence of sulfate ions, and (iv) uranyl in aqueous solutions under various pH conditions, promoting hydrolysed species. Results between the laboratories are compared in terms of number of decay components, luminescence lifetimes and spectral band positions. The potentials and limitations of TRES in uranyl analysis and speciation in aqueous solutions are discussed.

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“…The time-resolved emission spectroscopy (TRES) apparatus has been described in detail elsewhere. [24,25] Briefly, for decay measurements, the excitation wavelength was set to 266 nm and the decays were recorded at λ ϭ 612 or 589 nm, depending on the transition efficiency. As is usual for time-resolved experiments of this kind, the data analysis was performed by systematically excluding the first 10 µs of each decay, for which the intense short-lived luminescence of the pure BumimTf 2 N dominates and thus precludes any detection of the longlived europium species.…”

Section: Secondmentioning

confidence: 99%

Eu^III Luminescence in a Hygroscopic Ionic Liquid: Effect of Water and Evidence for a Complexation Process

Billard¹,

Mekki²,

Gaillard³

et al. 2004

Eur J Inorg Chem

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The spectroscopic characteristics (excitation, emission and lifetime) of EuIII dissolved in 1‐methyl‐3‐butylimidazolium bis(trifluoromethanesulfon)imide (BumimTf2N) are reported. In a first series of experiments, the effect of the presence of water in BumimTf2N was examined. It appears that non‐degassed solutions are most probably inhomogeneous, displaying large water clusters leading to an intense diffusion of the red light of an He:Ne laser. In these samples, the Eu emission spectrum is close to that observed in slightly acidic aqueous solutions. In contrast, when the samples were degassed the solution appeared homogeneous and water can be considered as a competitive ligand for the first coordination sphere of Eu. In a subsequent series of experiments, tetrabutylammonium chloride (TBACl) was added to the solution and the resultant species investigated. The ensuing enhancement in the metal‐centered luminescence has been interpreted in terms of changes in the inner coordination sphere of the EuIII ion and possible structures are discussed. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)

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Fluorescence of UO22+ in a non-complexing medium: HClO4/NaClO4 up to 10 M

Cited by 20 publications

References 36 publications

Photoexcitation of europium(III) in various electrolytes: Dependence of the luminescence lifetime on the type of salts and the ionic strength

Photoexcitation of europium(III) in various electrolytes: Dependence of the luminescence lifetime on the type of salts and the ionic strength

Aqueous Solutions of Uranium(VI) as Studied by Time-Resolved Emission Spectroscopy: A Round-Robin Test

Eu^III Luminescence in a Hygroscopic Ionic Liquid: Effect of Water and Evidence for a Complexation Process

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Fluorescence of UO22+ in a non-complexing medium: HClO4/NaClO4 up to 10 M

Cited by 20 publications

References 36 publications

Photoexcitation of europium(III) in various electrolytes: Dependence of the luminescence lifetime on the type of salts and the ionic strength

Photoexcitation of europium(III) in various electrolytes: Dependence of the luminescence lifetime on the type of salts and the ionic strength

Aqueous Solutions of Uranium(VI) as Studied by Time-Resolved Emission Spectroscopy: A Round-Robin Test

EuIII Luminescence in a Hygroscopic Ionic Liquid: Effect of Water and Evidence for a Complexation Process

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Eu^III Luminescence in a Hygroscopic Ionic Liquid: Effect of Water and Evidence for a Complexation Process