Collect. Czech. Chem. Commun. 1995, 60, 464-472

Spectrophotometric Study of the Formation of Iron(III) Complexes with Some Salicylic Acid Derivatives

Terézia M. Surányi, Evgenija A. Djurendić and Gyöngyi Gy. Vastag

Institute of Chemistry, Faculty of Science, Trg D. Obradovića 3, 21000 Novi Sad, Yugoslavia


The stoichiometric ratio and stability constants of iron(III) complexes with 1,n-di-O-salicyloylalkane-1,n-diols (n = 2 - 8) and N,N'-disalicyloyl-1,n-alkanediamines (n= 2 - 4) were determined spectrophotometrically. In 61.10% aqueous ethanol, the iron-to-ligand ratio is 1 : 1 (FeL+). The stability constants of the complexes were measured at 298 K and μ = 0.5 mol dm-3 (LiCl). Since the determination was performed in a glycinate buffer, the constants were corrected for the side reaction of iron(III) with glycine.