Mössbauer, electronic, and far infrared spectral studies of some tetrahedral iron(II) complexes

Abstract

The preparations are reported of some tetrahedral complexes of the types FeL₂X₂ and FeLX₃^–(L = quinoline or 3-methylisoquinoline, X = Cl, Br, or I) and of the tetrahedral compound Fe(quinoline)₂(NCS)₂. Their electronic spectra in the near i.r. region have been examined and, for most of them, room temperature Mössbauer parameters and magnetic moments have been measured. Mössbauer studies have also been made on the compounds (Et₄N)₂FeCl₄ and Fe(Ph₃PO)₂X₂(X = Cl or Br). These results are discussed in terms of the distortions of the ligand fields from T_d symmetry. I.r. data in the region 200–500 cm.^–1 are given for the complexes with heterocyclic amines.