[Li6(C2N2H8)11.5][Fe4Se8]: the first lithiumcontaining chalcogenidotetraferrate synthesized in solution

Abstract

The octa­selenido­tetra­ferrate(II/III) with six Li atoms as counter-ions chelated by ethyl­enedi­amine (en, C2H8N2), {[Li6(en)11.5][Fe4Se8]}n, was synthesized from Li, FeSe and Se in an ethyl­enedi­amine solution at room temperature. Its crystal structure was determined at 100 K and has triclinic (P[\overline{1}]) symmetry. The [Fe4Se8]6− anions show a connectivity comparable to a distorted tetra­hedral cluster structure. Contact distances are given, and central structure features compared to literature known selenidoferrates with the same anion motif.