SEARCH FOH OPTIMUM CONDITIONS OF EXTRACTION OF METAL COMPLEXES WITH ALKYLIMIDAZOLES. III. STRUCTURE - EXTRACTABILITY RELATIONSHIPS FOR 1,4-DIMETHYLIMIDAZOLE COMPLEXES OF Co(II), Ni(II), Cu(II), Zn(II), AND Cd(II)

ABSTRACT Stability constants of the 1,4-dimethylimidazole complexes of Co(II),Ni{II),Cu(II),Zn(II), and Cd(II) have been determined in aqueous solution and their structure has been elucidated. Conformational equilibria of the type octahedron-tetrahedron have been found in the case of the Co(II) and Sn(II) complexes. The extraction of all complexes has been shown to be dependent on their'molar contributions, d⊂n⊂ expressed in per cent. The distribution constants have determined for each complex and the composition of the species extracted with organic solvent has been suggested.The measurements were run at 298 K, at the ionic strength of the aqueous phase of 0.5 maintained by means of KNO⊂3⊂.