Sulphur-nitrogen chelating agents. IV. Metal complexes of o-methylthioaniline

Abstract

Complexes of o-methylthioaniline (NH₂-SMe) have been obtained with nickel(II), palladium(II), platinum(II), and copper(II). They are of the following types: NiX₂(NH₂-SMe)₂ (X = Cl, Br, I); PdX₂(SH₂-SMe) (X = Cl, Br, I, SCN); PdCl₂(NH₂-SMe)₂; [Pd(NH₂-SMe)₂](PF₆)₂; PtX₂(NH₂-SMe) (X = Br, I, SCN); [Pt(NH₂-SMe)₂][PtCl₄]; and CuX₂(NH₂-SMe) (X = Cl, Br). A conductimetric titration of [Pd(NH₂-SNe)₂]²⁺ with iodide ion in nitrobenzene solution shows that one molecule of ligand is displaced to give PtI₂(NH₂-SMe). If the complexes PdCl₂(NH₂-SMe) and [Pt(NH₂-SMe)₂][PtCl₄] are heated in dimethylformamide, S-demethylation of the ligand occurs to yield the thiolo-bridged complexes M₂Cl₂(NH₂-S)₂(M = Pd, Pt). The nickel complex NiI₂(NH₂-SMe)₂ is not demethylated under the same conditions.