Periodic tiling of triangular and square nanotubes in a cationic metal–organic framework for selective anion exchange

A unique cationic metal-organic framework was synthesized by connecting the neutral rod-shaped secondary building unit with a cationic dicarboxylate ligand. This framework showed a rare snub square tessellation pattern by the periodic tiling of triangular and square nanotubes. The charge- and size-dependent ion-exchange of anion dyes was investigated.