Ligands containing elements of group viB. Part VI. Transition metal complexes of some alkyl- and aryl-thioacetic and -selenoacetic acids

Abstract

Formation constants for complexes of some alkyl- and aryl-thioacetic and selenoacetic acids with divalent transition metal ions have been measured at 25° and I= 0·10M (KNO₃) using a method based on competing equilibria between silver and the metal ions for co-ordination to the ligands. A computerized minimization procedure is described. Complexes formed are of low stability but follow the general pattern of formation constants : alkyl > aryl; thio- > seleno- and Cu²⁺ > Co²⁺, ∼Mn²⁺, ∼Zn²⁺ > Ni²⁺, with Cd²⁺ showing variable class (a)–(b) character.