What question did this study set out to answer?

This research aims to investigate the formation of heteronuclear complexes in an iron and manganese system using acetate ions.

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March 1, 2026

HETERO-NUCLEAR COMPLEXES OF Fe, Fe, AND Mn WITH ACETATE IONS

Key Points

This research aims to investigate the formation of heteronuclear complexes in an iron and manganese system using acetate ions.
Analyzed heteronuclear complex formation in the Fe(III)–Fe(II)–Mn(II)–CHCOOH–HO system at 298.15 K.
Utilized the Clark–Nikolsky oxidation–reduction potential method.
Studied complex formation across a pH range from 2.0 to 10.
Examined the existence and predominance regions of the complexes.
Seven coordination compounds were identified during the investigation.
The identified compounds included species such as [FeAc(HO)] and [FeMnAc(HO)].
Two of the complexes were determined to be heteronuclear, while three contained hydroxyl groups.
Fe(II) was found not to participate in heteronuclear complex formation.

Abstract

Heteronuclear complex formation in the Fe(III)–Fe(II)–Mn(II)–CHCOOH–HO system was investigated by the Clark–Nikolsky oxidation–reduction potential method at 298.15 K and an ionic strength of 0.5 mol/L. It was shown that in this system the formation of complexes occurs over a pH range from 2.0 to 10. Seven coordination compounds are formed sequentially. The following compositions were established: FeAc(HO), FeAcOH(HO), FeMnAc(HO), FeMnAc(OH)(HO), FeAc(HO), Fe(Ac)(HO), and Fe(Ac)(OH)(HO). Two of these species are heteronuclear, and three contain hydroxyl groups in the inner coordination sphere. Fe(II) does not participate in the heteronuclear complex formation. Model parameters, existence and predominance regions, and proposed mechanisms for complex formation were determined for all complexes.

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HETERO-NUCLEAR COMPLEXES OF Fe, Fe, AND Mn WITH ACETATE IONS

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