Solvent Extraction of Silver(I) as Anionic Metal Complexes with 2-Thenoyltrifluoroacetone and 4-Isopropyltropolone into Chloroform in the Presence of Tetrabutylammonium Ions

Abstract

The solvent extraction of silver(I) in aqueous 0.1 mol dm-3 sodium nitrate solutions with 2-thenoyltrifluoroacetone (Htta) and 4-isopropyltropolone (f3-isopropyltropolone, Hipt) into chloroform was studied in the absence and presence of tetrabutylammonium ions (tba+), and the results were compared. Although extraction with Htta was poor, it was very much enhanced and nearly quantitative extraction was achieved by the addition of tba+. This was assumed to be due to the fact that the complex, Ag(tta), was hydrophilic due to its hydration, but tba+Ag(tta)2-, which was extracted in the presence of tba+, was very weakly hydrated and bulkier. Both Ag(ipt) and Ag(ipt)(Hipt) were extracted; extraction with Hipt was not very effective in the absence of tba+. By the addition of tba+, the anionic complex, tba+Ag(ipt)2-, was also extracted, and nearly quantitative extraction was also achieved. Since the formation of this anionic complex is made by an exchange of ipt-with Hipt of the Ag(ipt)(Hipt) species, the enhancement of extraction was impaired by the dissociation of Hipt from the self-adduct.

Solvent Extraction of Several Trivalent Metal Ions with 4-Isopropyltropolone into Chloroform

“…1,2 This was thought to be due to the extraction of polynuclear chelate complexes. On the other hand, it was also reported in these and other papers 3,4 that the distribution ratios of copper(II), zinc(II), thallium(I), and silver(I) with 4-isopropyltropolone into chloroform were not dependent on the initial metal concentration. Thus, extraction of the polynuclear species of these metal ions did not occur.…”

Radiotracer Study of Synergistic Effects of Organophosphorus Compounds on the Extraction of Silver by N-(thio acetyl) benzamide into n-butanol

“…Liquidliquid extraction methods are frequently used for the separation and preconcentration of silver. [9][10][11][12] A considerable amount of work has been carried out on solvent extraction of silver with sulfur-containing extractants from nitrate or sulphate media [13][14][15][16][17][18][19][20][21] , or calixarene derivatives [22][23][24] and calixarene analogs 25 , quaternary amine with chelating ligand HTTA, 26 as mixed extraction or extraction of Ag (I) from aqueous nitrate medium with hostguest assemblies involving macrocycles and different carboxylic acids. [27][28] But only a few attention has been paid on the synergistic effect of phosphine oxides on the extraction of Ag (I) from aqueous nitrate medium.…”

Chemical Equilibrium and Synergism for Solvent Extraction of Trace Lithium with Thenoyltrifluoroacetone in the Presence of Trioctylphosphine Oxide

“…15 In addition, the effects of structure of the neutral ligands were investigated on synergistic extraction of analytes with benzoylpyrazolone derivatives and various neutral ligands. 16,17 On the other hand, Ohmiya and co-workers 18 reported the experimental results for synergistic extraction of silver ion in aqueous solution into chloroform with TBA + as well as isopropyltropolone. Sekin et al 19 extracted six elements of copper, nickel, zinc and so on into chloroform with isopropyltropolone and TOPO.…”