Complexation of uranium(VI) with aromatic acids such as hydroxamic and benzoic acid investigated by TRLFS

Glorius, Maja; Moll, Henry; Geipel, Gerhard; Bernhard, Gert

doi:10.1007/s10967-007-7082-6

Cited by 21 publications

(33 citation statements)

References 21 publications

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“…If compared to the literature, there is a good agreement with the value determined with potentiometry by Vulpius et al [8]. The significant deviation between the two values gained by TRLFS might be explained by the fact that in contrast to the study of Glorius et al [9] in this study the TRLFS spectra were laser energy normalized. This was done because a decrease of the laser power over time was observed.…”

Section: Room Temperature Trlfs Measurementssupporting

confidence: 86%

“…4 illustrates the measured luminescence spectra at a fixed uranyl concentration of 5 × 10 −5 M and varying [BA] at pH 3.0. A strong decrease of the uranyl luminescence with increasing ligand concentration is observable, indicating the complex formation, as shown first by Glorius et al [9]. From this trend we can deduce, that the formed uranyl BA species shows no luminescence.…”

Section: Room Temperature Trlfs Measurementssupporting

confidence: 77%

“…UVVis spectroscopic measurements at pH 3.0 as well as pH 4.0 showed the formation of a 1 : 1 complex with a stability constant of 3.37 ± 0.14 (0.1 M ionic strength). In 2008 Glorius et al have validated their complex stability constant of the 1 : 1 complex with TRLFS measurements with a value of 3.56 ± 0.05 (0.1 M ionic strength) [9]. From TRLFS measurements conducted at 25 • C a ligand-initiated dynamic as well as a static quench process were deduced.…”

Section: Introductionmentioning

confidence: 97%

“…At such a ratio the concentrations of higher uranyl BA complexes are low. Recently, Glorius et al investigated the complexation of U(VI) by BA using UV-Vis spectroscopy and timeresolved laser-induced fluorescence spectroscopy [5,9]. UVVis spectroscopic measurements at pH 3.0 as well as pH 4.0 showed the formation of a 1 : 1 complex with a stability constant of 3.37 ± 0.14 (0.1 M ionic strength).…”

Section: Introductionmentioning

confidence: 99%

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A new uranyl benzoate species characterized by different spectroscopic techniques

Lütke¹,

Moll

Bernhard

2012

Radiochimica Acta

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For the first time in the aqueous phase the existence of a U(VI)-benzoate complex with a 1:2 stoichiometry could be proven. Using UV-Vis spectroscopy and especially cryo time-resolved laser-induced fluorescence spectroscopy (TRLFS) it was possible to characterize this complex in detail. Room temperature TRLFS measurements revealed a static as well as a dynamic ligand-initiated quench process in the U(VI)-benzoic acid system. At these conditions no luminescence emission resulting from complex formation was found. Consequently cryo TRLFS was applied to increase the maximum detectable benzoate:U(VI) ratio. By this for the first time a luminescence spectrum of the 1:2 U(VI)-benzoate complex could be determined. This species is characterized by emission bands at 467, 485, 505, 526, and 550 nm which are blue-shifted compared to the ones of the UO2 2+ ion. The luminescence lifetime of the 1:2 complex amounts to 9.21±0.01 μs at −18 ºC compared to 150.4±0.5 μs for UO2 2+. The stability constant of the newly found species log β 120 has been calculated to be 4.48±0.24. The stability constant of the 1:1 complex was validated to amount to 2.64±0.19. UV-Vis spectroscopy combined with factor analysis yielded the molar absorption spectrum of the 1:2 U(VI)-benzoate species which is characterized by absorption bands at 406, 418, 432.5, 447, and 461 nm and a molar absorption coefficient of 22 L mol−1 cm−1.

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Section: Room Temperature Trlfs Measurementssupporting

confidence: 86%

Section: Room Temperature Trlfs Measurementssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A new uranyl benzoate species characterized by different spectroscopic techniques

Lütke¹,

Moll

Bernhard

2012

Radiochimica Acta

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“…The strong and intense bands observed, clearly suggest the presence of something associated with oleate. The asymmetric carboxylate vibration band is attributed to chemisorbed oleate (21,22). The shift on the infrared spectrum of cassiterite demonstrates that there is a new compound formed on the surface of cassiterite.…”

Section: Infrared Spectrum Studiesmentioning

confidence: 96%

Surface Analysis of Cassiterite with Sodium Oleate in Aqueous Solution

Qin

2012

Separation Science and Technology

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The interaction of cassiterite with sodium oleate was investigated by flotation, adsorption, Zeta potential measurements, and infrared spectrum studies. Both adsorption and flotation recovery achieved a maximum at pH 7.8. The maximum recovery of cassiterite was 91%. The tendency of adsorption was in good agreement with that of flotation. Free energy of adsorption was calculated to be À8.36 kcal/mol. The isoelectric point (IEP) of cassiterite appeared at pH 5, and showed an acid shift in the presence of sodium oleate. This shift in IEP was attributed to chemisorption of oleate on cassiterite. The infrared spectrum studies revealed that there was a new compound formed on the surface of cassiterite after interacting with sodium oleate. The results conformed that the adsorption of sodium oleate on the cassiterite surface was due to chemisorption. Based on the experiment results, the adsorption of sodium oleate on the cassiterite surface was caused by the exchanging of ions chemically at the cassiterite-oleate interface.

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Structural Analysis of Uranyl Complexation by the EF‐Hand Motif of Calmodulin: Effect of Phosphorylation

Sauge‐Merle

Brulfert

Pardoux

et al. 2017

Chemistry A European J

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Better understanding of uranyl-protein interactions is a prerequisite to predict uranium chemical toxicity in cells. The EF-hand motif of the calmodulin site I is about thousand times more affine for uranyl than for calcium, and threonine phosphorylation increases the uranyl affinity by two orders of magnitude at pH 7. In this study, we confront X-ray absorption spectroscopy with Fourier transform infrared (FTIR) spectroscopy, time-resolved laser-induced fluorescence spectroscopy (TRLFS), and structural models obtained by molecular dynamics simulations to analyze the uranyl coordination in the native and phosphorylated calmodulin site I. For the native site I, extended X-ray absorption fine structure (EXAFS) data evidence a short U−Oeq distance, in addition to distances compatible with mono-and bidentate coordination by carboxylate groups. Further analysis of uranyl speciation by TRLFS and thorough investigation of the fluorescence decay kinetics strongly support the presence of a hydroxide uranyl ligand.For a phosphorylated site I, the EXAFS and FTIR data support a monodentate uranyl coordination by the phosphoryl group and strong interaction with mono-and bidentate carboxylate ligands. This study confirms the important role of a phosphoryl ligand in the stability of uranyl-protein interactions. By evidencing a hydroxide uranyl ligand in calmodulin site I, this study also highlights the possible role of less studied ligands as water or hydroxide ions in the stability of protein-uranyl complexes.

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Complexation of uranium(VI) with aromatic acids such as hydroxamic and benzoic acid investigated by TRLFS

Cited by 21 publications

References 21 publications

A new uranyl benzoate species characterized by different spectroscopic techniques

A new uranyl benzoate species characterized by different spectroscopic techniques

Surface Analysis of Cassiterite with Sodium Oleate in Aqueous Solution

Structural Analysis of Uranyl Complexation by the EF‐Hand Motif of Calmodulin: Effect of Phosphorylation

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