Liquid—liquid extraction of metal ions by the thiacrown compound 1,4,8,11-tetrathiacyclotetradecane

Liquid-Liquid Extraction of Some Class b Metal Ions with Thiacrown Ether 1,4,8,11-Tetrathiacyclotetradecane

“…4 The average copper(I)-sulfur bond length in the complex, [Cu(ttct)]+ClO4, is 2.32 A:13 this value is almost identical with that of 2.303 A found in the corresponding copper(II) complex. Consequently, copper(I) must be able to fit in the cavity of TTCT ligand.…”

“…In fact, it was shown that the perchlorates and picrates of class b metals are selectively extracted with a 1,2-dichloroethane solution of the thiacrown ether, 1,4,8,11-tetrathiacyclotetradecane(TTCT). 4 Furthermore, the extraction and spectrophotometric determination of copper and silver with TTCT by the use of an appropriate coloured anion such as Bromocresol Green or picrate has been reported. 5 Although the separation of class b metals from each other by solvent extraction will be primarily attributed to the difference of their softness, it might be made more selective by the relative sizes of the metal ion and the cavity of the macrocyclic compound, the choice of anion for formation of the ion-pair, and the kind of extraction solvents.…”

Extraction Behavior of Silver Ion with Cyclic and Acyclic Tetrathio Ethers and the Molecular Structures of the Silver Complexes

“…Four acyclic tetrathio ethers were synthesized by methods previously described. 1 Silver sulfate t To whom correspondence should be addressed .…”

Phenylenedimethylene Bis(dithiocarbamates) and Related Bis(dithiocarbamates) as Extractants of Silver

“…3 The possibility of conformational changes in the ligand cavity size is also a very important factor which has to be taken into account in the complex formation process. 4,5 In our previous study, silver(I) was perfectly extracted from perchlorate and thiosulfate media with thiuram disulfides.2,3 In the present study, novel bis(dithiocarbamates) with phenylenedimethylene groups connecting the two dithiocarbamate moieties are synthesized and are used to obtain general information on the solvent extraction of silver. Comparison of the extraction equilibria constants of the silver(I) complexes with phenylenedimethylene bis(dithiocarbamates) together with other alkylene bis(N, N diethyldithiocarbamates) and tetraethylthiuram disulfide are also investigated.…”