Crystal structure and Hirshfeld surface analysis of supramolecular aggregate of 2,2,6,6-tetramethylpiperidin-1-ium bromide with 1,2,3,4-tetrafluoro-5,6-diiodobenzene

Abstract

The asymmetric unit of the title compound, C₉H₂₀N⁺·Br^-·C₆F₄I₂, contains one 2,2,6,6 tetra-methyl-piperidine-1-ium cation, one 1,2,3,4-tetra-fluoro-5,6-di-iodo-benzene mol-ecule, and one uncoordinated bromide anion. In the crystal, the bromide anions link the 2,2,6,6-tetra-methyl-piperidine mol-ecules by inter-molecular C-H⋯Br and N-H⋯Br hydrogen bonds, leading to dimers, with the coplanar 1,2,3,4-tetra-fluoro-5,6-di-iodo-benzene mol-ecules filling the space between them. There is a π-π interaction between the almost parallel benzene rings [dihedral angle = 10.5 (2)°] with a centroid-to-centroid distance of 3.838 (3) Å and slippage of 1.468 Å. No C-H⋯π(ring) inter-actions are observed. A Hirshfeld surface analysis indicates that the most important contributions for the crystal packing are from H⋯F/F⋯H (23.8%), H⋯H (22.6%), H⋯Br/Br⋯H (17.3%) and H⋯I/I⋯H (13.8%) inter-actions. Hydrogen bonding and van der Waals inter-actions are the dominant inter-actions in the crystal packing.