Dimethylpyrazinium tetrabromidoferrate(II): Br...aryl...Br and Br...Br intermolecular interactions

Abstract

In the title compound, (C6H10N2)[FeBr4], the asymmetric unit contains one half-cation and one half-anion, where the Fe atom has a distorted tetra­hedral environment. The Fe atom and two Br atoms lie on a mirror plane; the cation is centrosymmetric. In the crystal structure, the cations and anions are packed into alternate stacking with no significant inter­molecular Br⋯Br and/or aryl⋯aryl inter­actions within each stack. The anion⋯anion stacks inter­act via Br⋯Br inter­actions [Br⋯Br = 3.8773 (15) Å] to form one-dimensional arrays. The Br⋯aryl inter­actions are arranged in a ⋯Br⋯ar­yl⋯Br⋯ar­yl⋯ infinite motif [Br⋯centroid distance of 3.928 (1) Å]. All of them link the anions and cations into two-dimensional layers.