Crystal structure and Hirshfeld surface analysis of the salt 2-iodo-ethyl-ammonium iodide - a possible side product upon synthesis of hybrid perovskites.

The title organic-inorganic hybrid salt, CHIN·I, is isotypic with its bromine analog, CHBrN·Br [Semenikhin (2024 ▸). E, 738-741]. Its asymmetric unit consists of one 2-iodo-ethyl-ammonium cation and one iodide anion. The NH group of the organic cation forms weak hydrogen bonds with four neighboring iodide anions, leading to the formation of supra-molecular layers propagating parallel to the plane. Hirshfeld surface analysis reveals that the most important contribution to the crystal packing is from N-H⋯I inter-actions (63.8%). The crystal under investigation was twinned by a 180° rotation around [001].