Complexation of copper(II) with 8-mercaptoquinoline, 5,8-dimercaptoquinoline, and 5-thiomethyl-8-mercaptoquinoline at the copper(II) hexacyanoferrate(II) gelatin-immobilized matrices

Complexation reactions in the copper(II) hexacyanoferrate(II) gelatin-immob ilized matrix systems contacting aqueous solutions of 8-mercaptoquinoline 5 ,8-dimercaptoquinoline, and 5-thiomethyl-8-mercaptoquinoline in an alkaline medium (pH 12.0) were studied, It was found that the incorporation of thes e ligands into the inner coordination sphere of Cu(II) is preceded by the d estruction of copper(II) hexacyanoferrate(II) in the alkaline medium and fo rmation of polymeric [Cu(OH)(2)](n). Under these conditions, the CuL2 chela te is formed in the Cu(II)-8-mercaptoquinoline (HL) system, the Cu(HL)(2), [Cu(HL)(OH)(H2O)], and [Cu2L2(H2O)] complexes are formed in the Cu(II)-5,8- dimercaptoquinoline (H2L) system, and the Cu(HL)(2) and [CuL2](n) complexes are formed in the Cu(II)-5-thiomethyl-8-mercaptoquinoline (HL) system.