Complexation of Cm(III) and Eu(III) with 2,6-bis(5-(2,2-dimethylpropyl)-1H-pyrazol-3-yl)pyridine and 2-bromohexanoic acid studied by time-resolved laser fluorescence spectroscopy
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Antje Bremer
Abstract
The complexation of Cm(III) and Eu(III) with 2,6-bis(5-(2,2-dimethylpropyl)-1H-pyrazol-3-yl)pyridine (C5-BPP) and 2-bromohexanoic acid as lipophilic anion has been investigated by time-resolved laser fluorescence spectroscopy. Upon increasing ligand concentration three different Cm(III)-C5-BPP species with emission bands at 604.1 nm, 607.9 nm and 611.4 nm, respectively, are found and attributed to complexes with one, two and three C5-BPP molecules in the inner coordination sphere. Comparison with results of TRLFS experiments without 2-bromohexanoic acid shows that the C5-BPP ligand is able to completely displace the lipophilic anion from the inner coordination sphere, forming [Cm(C5-BPP)3]3+ complexes. This complex is also found in the organic phase of an extraction experiment performed with Cm(III), demonstrating that the lipophilic anion required for the extraction is not directly coordinated to the metal ion in the species formed during extraction. In case of Eu(III) the number of different species formed cannot be determined accurately. Nevertheless, the formation of the complex [Eu(C5-BPP)3]3+ in the presence of 2-bromohexanoic acid is confirmed.
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Artikel in diesem Heft
- Absence of 232,230,228Th enhancement decay by ultrasound exposure
- Complexation of Cm(III) and Eu(III) with 2,6-bis(5-(2,2-dimethylpropyl)-1H-pyrazol-3-yl)pyridine and 2-bromohexanoic acid studied by time-resolved laser fluorescence spectroscopy
- Americium, curium and neodymium analysis in ECRIX-H irradiated pellet: sample preparation for TIMS measurements
- Co-extraction and stripping behavior of trivalent actinides and fission products in N,N-di-2-ethylhexyl-N´,N´-dioctyl-diglycolamide
- Mass spectrometric characterization and quantification of Pu(VI) hydrolysis products
- Effects of aging on PuO2·xH2O particle size in alkaline solution
- Redox behavior of Tc(VII)/Tc(IV) under various reducing conditions in 0.1 M NaCl solutions
- Cyclotron production of 44Sc for clinical application
- Proton irradiation parameters and chemical separation procedure for the bulk production of high-specific-activity 186gRe using WO3 targets
