Thenoyltrifluoroacetone solvent extraction

Manchanda, V.K. Chang, C.A. Solvent extraction studies of lanthanum(III) and neodymium(III) with ionizable macrocyclic ligands and thenoyltrifluoroacetone, Anal. Chem. 58 (1988) 2269-2275. 

Attempts to obtain thermodynamic data for solvent extraction of Bk(III) by thenoyltrifluoroacetone in benzene and for complexation of Bk(III) by hydroxide and citrate ions were unsuccessful (202). The high extractability and complexability of the easily accessible tetrava-lent state of berkelium probably accounts for the difficulty encountered in this work. 

Since the chemistry of actinium is confined to the Ac + ion, it can readily be separated from thorium (and the lanthanides, for that matter) by processes like solvent extraction with thenoyltrifluoroacetone (TTFA) and by cation-exchange chromatography. The latter is an excellent means of purification, as the Ac + ion is much more strongly bound by the resin than its decay products. 

Samples were purified before activation using the solvent extraction procedure of Hahn et al. (22) with thenoyltrifluoroacetone as the ligand. An activation routine was developed to avoid subsequent contamination with aluminum, to allow the excape of Ar, to monitor flux variations, and to facilitate spectrum stripping of residues of manganese, aluminum, and sodltun (15). The advent of high efficiency germanium detectors has significantly reduced the... 

Among ion exchange separation methods for transuranics, strong base anion exchange in hydrochloric and nitric acids is important (Keder, 1962 Keder et al., 1960 Horowitz et al., 1990 Chu, 1971 Wong, 1971 Diamond et al., 1954 Korkisch, 1989). Among solvent extraction reagents for transuranics, thenoyltrifluoroacetone (TTA) and trioctylamine (TOA) are important (Keder, 1962 Chieco et al., 1990). 

Actinium was originally isolated from uranium minerals in which it occurs in traces, but it is now made on a milligram scale by neutron capture in radium (Table 28-2). The actinium +3 ion is separated from the excess of radium and isotopes of Th, Po, Bi and Pb formed simultaneously by ion-exchange elution or by solvent-extraction with thenoyltrifluoroacetone. 

This is a study of the complexation of zirconium by hydroxide using the solvent extraction technique. Experimental work in the study was conducted at 25°C and in 1.96 M (Li, H)C104. Benzene was used as the organic phase and thenoyltrifluoroacetone (TTA) as the extractant. The hydrolysis data was analysed using the previously determined stability constants determined by Solovkin and Ivantsov [66SOL/IVA] using the same technique. The study therefore suffers from the same deficiencies as before and as such cannot be recommended. 

A solvent extraction method was used to determine, the stability of NiCU and NiSCN complexes, among others. The aqueous phase was 1 M NaC104 solution, while the organic phase was CCI4 containing 0.05 M thenoyltrifluoroacetone and 0.03 M trioctyl-phosphine. The concentration of nickel(II) was 1.0 x 10 M, while that of the complex forming anion varied up to 0.4 M for thiocyanate and ca 0.85 M in case of chloride. As the amount of metal extracted was very low in the case of chloride, even at high chloride concentrations, only the formation constant reported for the thiocyanate complex is considered in this review. 

The nature of the extractable species in the solvent extraction of aqueous complexes of La(III), Eu(III) and Lu(III) with macrocyclic ligands 1,7-diaza-4,10,13-trioxacyclopenta-decane-N, N -diacetic acid (DAPDA) and 1, lO-diaza-4,7,13,16-tetraoxacyclooctadecane-N, N -diacetic acid (DACDA) using thenoyltrifluoroacetone (HTTA) as the extractant in chloroform, nitrobenzene and benzene, has been compared by Manchanda et al. (1988). The extraction reaction is... 

Noro and Sekine (1992) noticed that the solvent extraction of Eu " with benzoyltrifluoroace-tone into carbon tetrachloride was enhanced by the addition of bulky cations such as the tetra-butylammonium ion. This was attributed to the fact that the tetrakis complex [Eu(btfac)4] is extracted as an ion pair with tetrabutylammoniuin, [Eu(btfac)4] (C4H9)4N+, and that this ion pair is more easily extracted than the tris complex [Eu(btfac)3]. Similar results were obtained for the extraction of Pr + and Nd " " with 2-thenoyltrifluoroacetone (Noro and Sekine, 1993a, 1993b). 

Similar to the Sr example, lanthanide extraction into ILs has been reported to yield different structures than when prepared with an organic solvent instead the IL. In ILs, the formation of anionic Nd(tta)4 or Eu(tta)4 (Htta = 2-thenoyltrifluoroacetone) complexes with no water coordinated to the metal center is preferred. In nonpolar organic solvents, hydrated, neutral complexes, M(tta)3(H20)M (n = 2 or 3) form [162],... 

Extractions involving the chelating agent thenoyltrifluoroacetone (TTA) in an organic solvent are particularly useful in the isolation of uranium, neptunium, and plutonium from nitric acid solutions some of the radiochemical milking experiments used to determine the... 

Solvent in all extractions isobutyl methyl ketone APDC = ammonium pyrrolidinedithiocarbamate DDDC = diethylammonium diethyl dithiocarbonate TIO = tri-iso-octylamine TTA = thenoyltrifluoroacetone ( ) indicates partial extraction... 

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