Organic molecular tessellations and intertwined double helices assembled by halogen bonding. Issue 7 (23rd January 2019) - Ng, Chun-Fai
Abstract : Crystalline polymorphs featuring halogen-bonded single-component supramolecular polygonal tessellations, a network of 41 - and 43 -double helices, and intertwined 31 and 32 meso -helices. Abstract : Isomeric 2, 5- and 2, 6-bis(iodoethynyl)pyrazine have been employed to assemble single-component polygonal molecular tessellations and intertwined double helices via intermolecular ethynyl C—I⋯N halogen bonding. X-ray crystallography elucidated the 3D supramolecular architectures of five ditopic heteroaromatic polymorphs obtainable via crystallization in various organic solvents.