Combining halogen and hydrogen bonding in the 1 : 1 molecular salt (hexamethylenetetraminium) - ( p-iodobenzoate) to form 1-D zig-zag chains

摘要

The crystal structure of the molecular salt (hexamethylenetetraminium) - (p-iodobenzoate) is the first example of a complex using the hexamethylene (HMTA) molecule that has both halogen and hydrogen bonding. The desired supramolecular packing arrangement of 1-D zig-zag chains was observed. A detailed breakdown of related HMTA complexes in the literature was used to show that zig-zag chains are a common packing feature of HMTA complexes with bifunctional molecules. The crystal structure determination of the molecular salt shows that the two intermolecular interactions N––Hb -OOC and N- I are positionally disordered around a centre of inversion.