Uranium(IV) and Thorium(IV) Coordination Polymers Based on Tritopic Carboxylic Acids

Rigidtritopic linkers of different sizes were used to buildporous U-(IV) and Th-(IV) 3D frameworks. The charge of the polymerscould be tuned by reaction conditions such as the temperature, pH,solvent, ligand, or metal precursor, yielding a series of neutralor positively or negatively charged frameworks. Postsynthetic solventsubstitution revealed a rare crystal-to-crystal transformation froma cationic to a neutral framework.