Magnetic and spectral studies including metal–ligand vibrations of thiourea complexes of some salts of divalent metals with oxyanions

Abstract

The preparations and infrared spectra (400–130 cm.^–1) are reported for the compounds M(tu)₂(CH₃CO₂)₂(tu = thiourea; M = Co, Zn, or Cd), M(tu)₃XO₄(M = Co or Zn, X = S or Se; M = Cd, X = S), Ni(tu)₄XO₄,MeOH (X = S or Se), M(tu)₃S₂O₃(M = Co, Zn, or Cd), M(tu)₃S₂O₃, H₂O (M = Co or Zn), M(tu)₄(ClO₄)₂(M = Co, Zn, or Cd) and M(tu)₄(NO₃)₂(M = Co, Zn, or Cd). Electronic spectra and magnetic measurements are reported for the cobalt and nickel compounds. The structures of the complexes are discussed in the light of these results. All appear to have essentially tetrahedral co-ordination of the metal ion, except for the nickel complexes which are planar, and one of the three crystalline forms of Co(tu)₄(NO₃)₂, in which severe distortion of the tetrahedron is indicated.