Improved NH Uptake of a Macromolecule-Metal Complex Constructed with Dual Polymeric Ligands and M(II).

MOFs are considered as efficient NH adsorbents for their high capacity but are accompanied by the collapse of MOFs. In this work, macromolecule-metal complexes (MMCs), which could provide metal sites like MOFs, were developed for reversible NH uptake with high capacity with the assistance of the polymeric ligands. Based on the tunable structure of MMCs, the role of the polymeric ligands and metallic center was investigated.

Porous acid-base hybrid polymers for enhanced NH uptake with assistance from cooperative hydrogen bonds.

Carboxylic acid-modified materials are a common means of achieving efficient NH adsorption. In this study, we report that improved NH adsorption capacity and easier desorption can be achieved through the introduction of substances containing Lewis basic groups into carboxylic acid-modified materials. Easily synthesized mesoporous acid-base hybrid polymers were constructed with polymers rich in carboxylic acid and Lewis base moieties through cooperative hydrogen bonding interactions (CHBs).

Ionic framework constructed with protic ionic liquid units for improving ammonia uptake.

In this work, an ionic framework [Ph3ImH][Tf2N]2 constructed from protic imidazolium ionic liquid units through ionic and hydrogen bonding interactions was synthesized for selective ammonia uptake. Investigation of the NH3 uptake mechanism indicates that the acid sites in [Ph3ImH][Tf2N]2 would be frustrated when contacted with NH3, and the frustration of [Ph3ImH][Tf2N]2 precipitates NH3 capture by hydrogen bonding and physical interactions, and the NH3 could be released under mild conditions. There was no obvious decrease in capacity over 10 consecutive cycles of ammonia uptake and release.