ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Investigation of 8-mercaptoquinoline (thiooxine) and its derivatives .114. Inner complex-compounds of 6-methyl-5-sulfo-8-mercaptoquinoline

A. Deme, J. Ashaks, Y. Bankovskii, M. Zikmund, and P. Brusilovskii

Institute of Inorganic Chemistry, Academy of Sciences of the Latvian SSR, SU-229 021 Salaspils

Abstract: The interaction of 6-methyl-5-sulfo-8-mercaptoquinoline with Zn(II), Cd(II), Hg(II), Ga(III), In(III), Pb(II), Sn(II, IV), Sb(III), Bi(III), Ag(I), Cu(II), V(IV), Fe(II, III), Co(II), Mo(VI), W(VI), Ni(II), Pd(II), Pt(II), Rh(III), Ir(III), Ru(III), Os(IV) in aqueous solutions has been investigated. Absorption spectra have been studied, composition, the dependence of forma- tion of inner complex compounds of 6-methyl-5-sulfo-8-mercaptoquinoline on hydrogen ion concentration, and stability constants have been determined. At ionic strength í = 0.1 mol dm^-3 and 0 = 2O°C the following values of the stability constants lg K₁ and (lg ß_n) have been found: VO⁺R - 8.0; Ni⁺R - 8.7; ZnR₂ -9.2 (17.8); CdR₂ -9.55 (18.3); PbR₂ -10.0 (16.45); Ga⁺R₂ -10.4 (20.3); InR₃ - 11.3 (29.5); Sb⁺R₂ - 14.25 (25.9); BiR₃ - 14.5 (31.1); Sn⁺R₃ - (35.0). According to the values of lg K₁ the stability of the complexes of 6-methyl-5-sulfo-8-mercaptoquinoline decreases in the order Bi, Sb, In, Ga, Pb, Cd, Zn, Ni, V.

Full paper in Portable Document Format: 395a649.pdf

Chemical Papers 39 (5) 649–666 (1985)