An unusual self-catenated cationic metal-organic framework for the selective adsorption of anionic dyes

Based on a tripodal N, O-donor ligand, an unusual self-catenated cationic metal-organic framework [Zn2(cdc)(tmpo)2]·2NO3·5DMF (H2cdc = 1,4‑cyclohexanedicarboxylic acid and tmpo = tris[4‑(2′‑methylimidazol‑yl)phenyl]phosphine oxide) has been synthesized and structurally characterized. This compound exhibits selective adsorption of anionic dyes.