Transition metal–Schiff base complexes. Part VI. Mössbauer and magnetic investigations of some iron(II) and iron(III) systems

Abstract

Iron(II) complexes of the quadridentate Schiff base NN′-ethylenebis(salicylideneimine) and related ligands are high-spin with Mössbauer parameters typical of iron(II). Failure to realise the air-sensitivity of these compounds has caused others to report unusually low isomer shifts and quadrupole splittings. Reaction of the appropriate amine and the bis(salicylaldehydato)iron(II) complex has some preparative advantages over direct reaction of the Schiff base with an iron(II) salt. Magnetic and Mössbauer results for distorted octahedral base adducts of bis(salicylaldehydato)iron(II) are also reported, and from like investigations some iron(III) chloro-complexes with Schiff bases are assigned monomeric five-co-ordinate structures.