Synthesis and Characterization of Iron(III) Complexes of a Substituted 2-Acetyi, Pyridine Thiosemicarbazone

Abstract

Iron(III) bis(ligand) complexes of a substituted thiosemicarbazone of 2-acetylpyridine have been prepared and charactmized by physico-chemical and spectroscopic methods. The complex prepared from ferric chloride was found to be a 1:1 electrolyte whereas others are non-electrolytes. The ligand deprotonates and coordinates via the pyridine nitrogen, imine nitrogen, and thiolate sulfur. The neutral ligand coordinates through imine and pyridine nitrogens only. The complex prepared from ferric chloride has an ion pair geometry involving a low-spin iron(III) cation antl high spin iron(III) anion. The EPR studies indicate a high-spin low-spin equilibrium for the nitrato complex. All other complexes are low spin.