Crystal structure of bis(1-ethylpyridinium) dioxonium hexacyanidoferrate(II)

Abstract

The title compound, (C7H10N)2(H3O)2[Fe(CN)6] or (Etpy)2(H3O)2[Fe(CN)6] (Etpy+is 1-ethylpyridinium), crystallizes in the space groupPnnm. The FeIIatom of the [Fe(CN)6]4−anion lies on a site with site symmetry ..2/m, and has an octahedral coordination sphere defined by six cyanido ligands. Both the Etpy+and the oxonium cations are located on a mirror plane. In the crystal, electron-donor anions of [Fe(CN)6]4−and electron-acceptor cations of Etpy+are each stacked parallel to thebaxis, resulting in a columnar structure with segregated moieties. The crystal packing is stabilized by a three-dimensional O—H...N hydrogen-bonding network between the oxonium ions and the cyanide ligands of [Fe(CN)6]4−.