Crystal engineering of 2-D hydrogen bonded molecular networks based on the self-assembly of anionic and cationic modules

Using a self-assembly strategy based on both H-bonding and ionic interactions, a molecular module composed of two cyclic amidinium units and that bears two additional OH groups, thus possessing a total of six H-bond donor sites, was used to engineer 2-D crystalline molecular networks in the presence of carboxylate anions.