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- W2091759611 abstract "The extraction of divalent manganese, cobalt, nickel and copper-thiocyanato anionic species from aqueous solutions by tricaprylmethylammonium chloride (R3R′NCl) in benzene has been investigated under different conditions. Both the aqueous and organic phases have been examined by spectrophotometry. Infrared spectro-photometry and measurements of water content, apparent molecular weight and magnetic moment have been applied to the organic extracts, and electron spin resonance experiments to the organic manganese(II)- and copper(II)-complexes. The mechanism of the extractions and the structures of the extracted complexes are discussed on the basis of the results obtained. As a result, it is found that although the extraction efficiency follows the order Co > Cu > Mn > Ni, the extraction of divalent transition metals is expressed as [M(NCS)4]2-(aq) + 2R3R′NNCS(org)→(R3R′N)2-[M(NCS)4](org) + 2NCS-(aq) in which M = Mn, Co, Ni and Cu. The extracted species of divalent manganese, cobalt and nickel give a tetrahedral Td symmetry, and the copper(II) species is in a distorted tetrahedron (point group D2d symmetry). In addition the species of nickel (II) extracted at low aqueous concentration exists as a complex (R3R′N)2[Ni(NCS)4(H2O)2] in an octahedral arrangement." @default.
- W2091759611 created "2016-06-24" @default.
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- W2091759611 date "2007-04-24" @default.
- W2091759611 modified "2023-09-23" @default.
- W2091759611 title "The extraction of anionic complexes of divalent manganese, cobalt, nickel and copper from aqueous thiocyanate solutions by tricaprylmethylammonium chloride" @default.
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- W2091759611 doi "https://doi.org/10.1002/jctb.503290108" @default.
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