Amino acid complexes of iron. I. Iron(II) complexes of thioglycollic acid, L-cysteine and related ligands

Abstract

A number of solid complexes, most of which are extremely unstable in air, have been isolated from reactions between aqueous iron(II) and the sulphur-containing ligands thioglycollic acid, L-cysteine, L-cysteine methyl ester and DL-methionine. The 1 : 1 and 1 : 2 iron-ligand stoichiometries were obtained. Spectroscopic and magnetic measurements have been used to deduce possible structures and in most cases polymeric structures are indicated.