Spectral and magnetic properties of some anhydrous divalent metal thiocyanates and their methanol and ethanol complexes

Abstract

The preparation, i.r. and electronic spectra, and magnetic properties of M(ROH)₂(NCS)₂(R = Me or Et; M = Mn, Co, or Ni), M(NCS)₂(M = Mn, Co, Ni, Zn, or Cd), and Co(NCS)₂,½H₂O are reported. The alcohol complexes have pseudo-octahedtal co-ordination with bridging thiocyanate groups. For M(NCS)₂(M = Mn, Fe, or Ni) and Co(NCS)₂,½H₂O the results indicate a tetragonal N₂S₄ co-ordination sphere with triply ligating thiocyanate ions; anhydrous cobalt thiocyanate however has a different structure. The magnetic properties of Mn(NCS)₂ and Co(NCS)₂,½H₂O indicate negative magnetic coupling through the thiocyanate bridges but in Ni(NCS)₂ the positive coupling through the sulphur bridges overrides this effect.