Arylamine co-ordination complexes. Part III. o-Phenylenediamine complexes of cobalt(II), nickel (II), and zinc(II) containing polyatomic anions

Abstract

An account is given of some complexes of the type M(diamine)₂X₂(X =½ SO₄, ½SeO₄, NO₃, NCS, NO₂), [M(diamine)₂(H₂O)₂]YO₄, and M(diamine)₃YO₄(Y = S, Se), where the diamine is o-phenylenediamine and in some cases 4-methyl-o-phenylenediamine and M is Ni and in some cases Co or Zn. The compounds are six-co-ordinate and have been characterised by magnetic and spectral measurements. Measurements of NH₂ and CN stretching frequencies indicate the presence of some unidentate diamine in the 3 : 1 complexes and of bidentate diamine in the 2 : 1 complexes. The species [Ni(diamine)₂Z₂](Z = H₂O, NO₃, and NO₂) appear to have trans-structures.