Hexaisothiocyanates of vanadium(II)

Abstract

Infrared spectra show that the new vanadium(II) complexes [cation]₄[V(NCS)₆], where cation = NMe₄⁺, NEt₄⁺, Hpy⁺, or Hhex⁺[py = pyridine, hex = hexamine (hexamethylenetetramine)], contain N-bonded thiocyanate, and the V–NCS stretching vibrations are at considerably higher frequencies than for corresponding complexes of later metals of the first transition series. The frequencies of the lowest-energy d–d band confirm that N-bonded thiocyanate is present. The complexes obey the Curie law, and [NEt₄]₄[V(NCS)₆] is isomorphous with the analogous nickel(II) salt.