Crystal structure and Hirshfeld surface analysis of the salt 2-iodo­ethyl­ammonium iodide – a possible side product upon synthesis of hybrid perovskites

Abstract

The organic 2-iodo­ethyl­ammonium cation forms N—H⋯I hydrogen bonds with iodide anions, forming supra­molecular layers.

The title organic–inorganic hybrid salt, C₂H₇IN⁺·I⁻, is isotypic with its bromine analog, C₂H₇BrN⁺·Br⁻ [Semenikhin et al. (2024#). Acta Cryst. E80, 738–741]. Its asymmetric unit consists of one 2-iodo­ethyl­ammonium cation and one iodide anion. The NH₃⁺ group of the organic cation forms weak hydrogen bonds with four neighboring iodide anions, leading to the formation of supra­molecular layers propagating parallel to the bc plane. Hirshfeld surface analysis reveals that the most important contribution to the crystal packing is from N—H⋯I inter­actions (63.8%). The crystal under investigation was twinned by a 180° rotation around [001].