Abstract
The acid dissociation constants,
k
a1
and
k
a2
, of thiosalicylic acid (TSA) have been determined in 75 vol % dioxane-water medium at 30°C, and complex formation of TSA with Zn(II), Cd(II), Hg(II) and Pb(II) investigated potentiometrically in the same medium.
Complexes of empirical formulae Hg(C
7H
5O
2S)Cl, Hg(C
7H
5O
2S)
2, Zn(C
7H
4O
2S), Cd(C
7H
4O
2S) and Pb(C
7H
4O
2S) have been isolated and characterized and the essential features of their i.r. spectra in the region 4000-200 cm
−1 are discussed. It is concluded that TSA coordinates with Hg(II) through the sulphur atom only, while it coordinates with the other metals through both sulphur and oxygen atoms.