ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Mutual effect of ligands and spontaneous redox reactions of iron(II) and iron(III) complexes in acetone and methanol. II

J. Šima, E. Horváth, and J. Gažo

Slowakischen Tech. Hochsch., Bratislava

Abstract: The influence of acetone, O, and of chlorides on the oxidn. of Fe(II) to Fe(III) for the systems Fe(II)-Cl^--O₂-acetone-methanol was studied. Acetone and O have an oxidizing effect on Fe(II). For a high acetone content, the O effect is negligible. The rate of the redox process decreases in systems with excess Cl^-, due to the formation of [FeCl₄]^2- which are comparatively stable against redox changes. The O contribution to the oxidn. of Fe(II) in these systems is more pronounced; the oxidn. rate of Fe(II) to Fe(III) is greater for a lower acetone content than in systems of lower Cl^- concn. Complexes that undergo redox processes are those with a heterogeneous coordination sphere; likewise, the redox behavior of complexes is conditioned by the formation of σ donor and σ donor and π receptor systems in the coordination sphere. The function of the chloro ligand in the oxidn. mechanism of Fe(II) by acetone was verified. The function of O as a ligand in the oxidn. mechanism of Fe(II) as well as the products of its redn. were not investigated in detail.

Full paper in Portable Document Format: 301a66.pdf (in German)

Chemical Papers 30 (1) 66–72 (1976)