[en] TTA, a classical complexing agent of metallic cations, has been studied by UV-vis in the ionic liquid (IL) 1-methyl-3-butyl-imidazolium bis-triflimide (BumimTf2N), in the presence of variable amounts of water. Depending on the water content, the keto-hydrate/enol equilibrium kinetics can last up to tens of hours. Modelling by use of classical homogeneous kinetic equations appears unsatisfactory, which pledges for the existence of non-homogeneous phenomena in such solutions, most probably related to the state of water in ILs. (authors)

[en] The behavior of ⁸⁸Y, ¹⁵²Eu, ²²⁸Ac, ²⁴¹Am, and ²⁴⁴Cm was studied with 2-thenoyltrifluoroacetone resin with batch uptake, kinetics and column studies. Studies were performed in acetate buffer solutions (pH ∼ 2 to ∼ 6) and there was high uptake of all isotopes, except ²²⁸Ac, at pH > 4.5. The kinetics of uptake were reasonable, although slower for the actinides, and sufficient for column studies. The retention of ⁸⁸Y, ¹⁵²Eu, and ²⁴¹Am on the resin in column studies was demonstrated as well as a reasonable separation of these isotopes from ²²⁸Ac. (author)

[en] A sensitive co-fluorescence enhancement system was developed for the fluorimetric detection of europium, terbium, samarium and dysprosium ions. The fluorescence intensities of the ternary chelates of Eu³⁺ (and Tb³⁺, Sm³⁺ or Dy³⁺) with pivaloyltrifluoroacetone and 1,10-phenanthroline in a solution containing Triton X-100 and ethanol were greatly enhanced by the addition of excess of Y³⁺, Lu³⁺, Gd³⁺ or La³⁺. Y³⁺ enhanced the fluorescence intensities of Eu³⁺, Tb³⁺, Sm³⁺ and Dy³⁺ chelates 130-, 1078-, 61- and 102 fold, respectively. The limits of detection of Eu³⁺, Tb³⁺, Sm³⁺ and Dy³⁺ in the developed co-fluorescence enhancement solution were 0.035, 0.34, 7.9 and 46 pM, respectively, when measured with a sensitive time-resolved fluorimeter. The present enhancement system is well suited for the fluorimetric determination of lanthanide ions used, e.g., as labels in time-resolved fluorimetric immunoassays. As compared with a direct enhancement system, the co-fluorescence enhancement solution benefits from higher fluorescence intensities and prolonged decay times. Therefore, it is particularly well suited for a multi-label immunoassay, where several analytes are to be measured simultaneously from a single sample by employing three or four chelate labels. (author). 19 refs.; 5 figs.; 6 tabs

[en] This paper reports a novel patternable temperature sensitive paint (PTSP) which can be photolithographically patterned. The proposed PTSP consists of europium (III) thenoyltrifluoroacetone (Eu(TTA)₃) as a luminescent material and SU-8 as a photosensitive matrix. The optimal patterning condition was investigated and the PTSP microstructures as small as 2 μm were successfully patterned. The luminescence from the micro-patterned PTSP was observed and the temperature sensitivity was measured as high as −0.8%/°C

[en] Studies were carried out on the effect of storing purified Pu (IV) over a period of time at lower nitric acid concentrations by observing solvent extraction, co-precipitation, alpha liquid scintillation counting and visible spectrum of the resultant plutonium. Plutonium was purified by anion exchange method using Dowex 1×4. The eluted plutonium was stored in different media such as 3 M HNO₃ (0.784mg/ml), 0.35 M HNO₃ (0.813mg/ml), 0.1 M HNO₃ (0.817mg/ml) and 0.005 M HNO₃ (0.653mg/ml) for one week and an aliquot of this solution was introduced in 1 M HNO₃ and TTA extraction and coprecipitation studies with thorium oxalate were carried out and the results are given. After ion exchange purification, the eluted solutions stored in 0.35 M HNO₃ and 3M HNO₃ yielded 97.32 and 97.78 % extraction to TTA from 1 M HNO₃, showing near quantitative presence of Pu (IV) in the eluted solutions. Treatment of these solutions with 0.05 M NaNO₂ resulted in 98.89 and 99.6 % extraction of Pu into TTA. No precipitation was observed for Pu stored in 0.005 M HNO₃ however, estimation using α liquid scintillation counting showed 85% of the expected counts indicating quenching probably due to hydrolysis and polymerization

[en] The thermal behavior, structure and photoluminescence features of an innovative organic/inorganic hybrid matrix built from the co-condensation of two di-ureasils frameworks (d-U(900) and d-U(600)), one of which incorporates poly(oxyethylene) (POE) chains with about 15.5 repeat units and the other about 8.5 oxyethylene repeat units are reported. The co-condensed di-ureasil network has been doped with the Eu(tta)₃(H₂O)₂ (where tta^- is 2-thenoyltrifluoracetonate) complex. The effective interaction between the lanthanide ions and the host hybrid structure accounts for the increase of the emission overall quantum yield (36%) and for the ⁵D₀ quantum efficiency (57%) with respect to those of the complex alone (29% and 27%, respectively)

[en] A spectrophotometric method for the extraction and determination of microgram amounts of Ce(IV) is described on the basis of color reaction with 1-(2-theonyl)-3,3,3-trifluoroacetone (TTA) in benzene. An oxidising agent, benzoyl peroxide was used as stabilizer. The bright red colored Ce(IV)-TTA solution (in benzene) follows Beer's law at 414 nm over the range of 2-16 mu g Ce(IV) per ml of complex and stable for 2 hrs. The effect of adverse ions has been studied and tolerable amounts of these ions have been described. The method is reproducible to within +- 2% and offer a simple procedure for extraction and determination of Ce(IV) in aqueous as well as organic phase. (author)

[en] The synergic solvent extraction of Pr, Gd, and Yb with mixtures of thenoyltrifluoroacetone (HTTA) and a crown ether benzo-15-crown-5 (B15C5) in CCl₄, C₆H₆ and CHCl₃ has been studied. The composition of the extracted species has been determined as Ln(TTA)₃*2B15C5(Ln=Pr, Gd, and Yb). The values of the equilibrium constants have been calculated

[en] We have studied the extraction of Eu(III), Am(III), Th(IV), U(VI) and Np(V) by 4 diamides (DMDHOPDA, N,N'-dimethyl-N,N'-di hexyl-3-oxapentanediamide; DHOPDA, N,N'-dihexyl-3-oxapentanediami de; DMDHTPDA, N,N'-dimethyl-N,N'-di hexyl-3-thiopentanediamide; DHTPDA, N,N'-dihexyl-3-thiopentanediam ide) from perchlorate solutions. Synergistic extraction was observed with these diamides and thenoyltrifluoroacetone (TTA) in which the main extraction species determined are M(TTA)₃(DA) (M=Eu, Am), Th(TTA)₃(DA)(X), UO₂(TTA)₂(DA) (DA: diamide, X^-: ClO₄^- or CH₂ClCOO^-). The species, M(DA)₃(X)₃, M(DA)₃(TTA)(X)₂, M(DA)₂(TTA)₂(X) and M(DA)(TTA)₃ are observed in the synergistic extraction of DMDHOPDA+TTA. (orig.)

[en] This paper reports the relative plutonium extraction rate from 1M nitric acid with thenoyltrifluoroacetone (TTA) dissolved in several different solvents. The marked differences in extraction rate are discussed in terms of the extraction mechanism. Experiments with varied phase mixing conditions, and with varied TTA or nitrate concentrations, have been performed to help clarify the mechanisms and explain the differences in extraction rate. The results show that in several solvents, plutonium is extracted as a mixed nitrate-TTA complex. The suitability of the various solvents for differing applications was also examined. Methyl benzoate is an ideal solvent when preparing counting sources from the solvent phase. Chloroform is preferable as solvent when the plutonium is to be backwashed into nitric acid. (author)