Charge mis-matched hydrogen bonded frameworks for cation exchange and dye sorption

Anionic hydrogen bonded frameworks were synthesised from di or tetra-amidinium hydrogen bond donor components and a charge mis-matched tecton possessing a 5(-) charge but only four hydrogen bond accepting groups. The net negative charge on the framework skeletons necessitates the presence of a cation in the framework channel. In one of the frameworks, the initially incorporated organic cation was rapidly displaced by smaller inorganic cations, or the cationic dye methylene blue. This facilitated the effective and selective removal of this dye from water.

Automated summary

Anionic hydrogen bonded frameworks were synthesized using di or tetra-amidinium hydrogen bond donor components and a charge mis-matched tecton. The presence of a cation in the framework channel is required due to the net negative charge on the framework skeletons. The organic cation initially incorporated in one of the frameworks was displaced by smaller inorganic cations or the cationic dye methylene blue, enabling effective and selective removal of the dye from water.