| Abstrakt: |
The extraction of various metal ions from hydrochloric acid solutions with tris(2,6-dimethoxyphenyl)phosphine, [2,6-(MeO)2C6H3]3P, abbreviated to (2,6-MeOPh)3P, and its tertiary and quaternary phosphonium salts were studied. A series of phosphonium salts, [(2,6-MeOPh)3PH]+ClO−4, [(2,6-MeOPh)3PR]+Br−and {[(2,6-MeOPh)3P]2R′}2+(Br−)2, where R = C12H25, C18H37or C6H5CH2and R′ = p-CH2C6H4CH2, (CH2)3and (CH2)10, were synthesized and applied to an anion exchanger for chloro complex anions of various metal ions. (2,6-MeOPh)3P and [(2,6-MeOPh)3PR]+Br−were found to be effective for the extraction of metal ions such as iron(III), gold(III) and gallium(III), forming tetrachloro complex anions of the MIIICl−4type. The extractabilities of the doubly charged cationic quaternary phosphonium salts [{(2,6-MeOPh)3P}2R′]2+(Br−2, were found to be superior to those of the singly charged cationic phosphonium salts for metal ions such as cadmium(II), platinum(II) and palladium(II), forming a tetrachloro complex doubly charged aion of the MIICl2−4type. Most of the metal ions are extracted through ion-pair formation between their chloro complex anions and the phosphonium cations. |
