High and selective Ag(I) bulk liquid membrane transport with N,N-diethyl-N′-camphanyl thiourea and structure of the complex

Competitive bulk liquid membrane transport and solvent extraction of some transition and post-transition metal ions using acylthiourea ligands as ionophores

“…For HL 1 and HL 2 , a source phase pH of 5.5 and a receiving phase pH of 1.0 were adopted as optimum conditions, so that the effect of varying the ligand concentration from 1 Â 10 À3 to 2 Â 10 À3 mol dm À3 on the transport efficiency and selectivity for Ag(I) could be studied. For HL 3 , we have studied the effect of varying the ligand concentration as well as pH of the source phase.…”

“…We report herein the first comprehensive study of the use of these ligands for metal ion transport using bulk liquid membranes, with particular reference to the results which were obtained with the ligand N,N-diethyl-N 0 -camphanylthiourea. 1 This ligand showed remarkably high and selective transport rates for Ag(I) in the presence of several other transition metal ions. We also carried out comparative competitive liquid-liquid extraction experiments using the above ligands with the seven metal ions.…”

“…We recently published a preliminary report illustrating the highly selective Ag(I) bulk liquid membrane transport using N,N-diethyl-N 0 -camphanylthiourea as well as the unusual crystal structure formed by this complex. 1 The N,N-dialkyl-N 0 -aroylthioureas have long been known since their first synthesis by Neucki in 1873. 2 The co-ordination chemistry and potential applications (solvent extraction) of mainly N,Ndialkyl-N 0 -aroylthioureas with transition metals was first explored by the groups of Hoyer and Beyer 3 and later Ko¨nig, Schuster et al 4 explored the similar chemistry of these ligands with the platinum group metals.…”

Synthesis and Characterization of N-(Arylcarbamothioyl)-cyclohexanecarboxamide Derivatives: The Crystal Structure of N-(Naphthalen-1-ylcarbamothioyl)cyclohexanecarboxamide

“…Some of the most important chelating extractants are thiourea derivatives, which have been known for a long time and are easily synthesized in good yields. Metal complexes of thiourea derivatives have been the subject of considerable study [1,2,3,4,5,6,7,8,9,10,11,12,13]. The presence of hard O- and N- and soft S-donor atoms in the backbones of these ligands enable them to react readily with both transition group and main group metal ions, yielding stable metal complexes, some of which have been shown to exhibit interesting physico-chemical properties and significant biological activities [13,14,15].…”

Extraction and transport of gold(III) using some acyl(aroyl)thiourea ligands and a crystal structure of one of the complexes

“…All ligands were synthesised according to the method of Douglass and Dains [10] and characterised by means of elemental analysis, IR and NMR, as described previously [4,11,12]. All aqueous solutions were prepared using deionised water.…”