Crystal supramolecularity of organic–inorganic hybrids of polyhalides: structures of 2,5-dibromopyrazinium triiodide and 2-bromopyridinium dibromoiodide
Affiliations: Department of Chemistry, Al al-Bayt University, Mafraq 25133, Jordan | Department of Basic Sciences, Faculty of Science and IT, Al-Balqa’a Applied University, Salt, Jordan | Department of Chemistry, Jordan University, Amman 11942, Jordan
Abstract: Crystal structure determinations of the compounds (C4H4Br2N2)+[I3]−, 1, and (C5H5BrN)+[IBr2]−, 2, have been carried out. In 1, the anion is surrounded symmetrically by four cations. This arrangement results from both (π)N–H ··· I–I–I and I–I–I ··· Br–C(π) intermolecular interactions, tying the cations and anion into sheets of pseudo four fold arrays of cations and anions. The crystal lattice of 2 consists of stacks of cations and anions that are connected via C–Br ··· Br–I–Br, N–H ··· Br–I–Br, and Br–I–Br ··· IBr2 inter-stacks intermolecular interactions leading to a supramolecular assembled lattice. The IBr2− anions are also assembled in a nearly T-shaped dimeric motif where one bromide end is interacting with the central iodide atom in another IBr2− unit (I–Br ··· I angle of 154°). The extensive anion ··· cation intermolecular interactions in both compounds lead to a crystal supramolecularity.
Keywords: polyhalides, crystal supramolecularity, (π)N–H ··· X, C–X ··· X and X ··· X intermolecular interactions
