Soutenance publique de thèse de doctorat en Sciences chimiques - Liuxi Yang

Porous crystals with structural flexibility are difficult to realize because flexible molecules often rearrange or leave the lattice, leading to pore collapse. Since the early 2000s, it has become clear that combining robust intermolecular interactions with flexible linkers and deformable nodes can stabilize porous crystals during guest removal. Frameworks such as MOFs, COFs, and HOFs benefit from strong noncovalent interactions, yet permanently porous HOFs remain uncommon due to dense molecular packing.

Porous organic salts (POSs) offer an alternative strategy, assembling predictable networks from oppositely charged organic ions where electroneutrality and stoichiometry guide structure formation. However, most 3D POSs rely on planar guanidinium or tetrahedral tetraphenylmethane derivatives, resulting in a narrow set of topologies compared with the thousands of 3D nets catalogued in the Reticular Chemistry Structure Resource (RCSR).

Here we report triptycene-based ionic frameworks (TIFs) formed via charge-assisted ammonium–sulfonate hydrogen bonding. By tuning triptycene symmetry and functionalization, together with sulfonate linker geometry, we generated diverse supramolecular architectures with tailored porosity, stability, and function.