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Heterogeneous Oxidation of the [B10H10]2 – Anion by Iron (III) Sulfate: Iron (II) Complexes with 2,2’-Bipyridyl and 1,10-Phenanthroline and Macropolyhedral Borane Cluster [B20H18]2 – as a Counterion
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Published: 08 June 2026
(2026)
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Russian Journal of Inorganic Chemistry
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A. E. Gerusova, V. V. Avdeeva, E. Yu. Matveev, A. S. Kubasov & N. T. Kuznetsov

In this work, an efficient method for the synthesis of iron (II) complex compounds with the octadecahydro-eicosaborate anion [B20H18]2 – was developed. The method is based on the heterogeneous two-electron oxidation of the parent closo-decaborate anion [B10H10]2 – in acetonitrile using iron (III) sulfate, which is insoluble in the solvent used. The heterogeneous reaction leads to dimerization of the parent anion with the formation of an intermediate compound of probable composition [Fe (CH3CN)6][B20H18], which can subsequently undergo complexation reactions. An advantage of the heterogeneous synthesis is the ease of removal of the unreacted oxidant and the by-products formed from the system, while the target product remains in solution and can be used for subsequent complexation. Addition of ligands L (L = bipy, phen) to the reaction mixture yielded iron (II) complexes [FeL3][B20H18], which were characterized by elemental analysis, 11B NMR and IR spectroscopies. The structure of complex [Fe (phen)3][B20H18]·4MeCN was determined by X-ray diffraction.