An Unusual Porous Metal–Organic Framework that Demonstrates the Highly Efficient Exchange of Metal Ions and the Reversible Adsorption of Iodine

Abstract An exceedingly rare porous metal–organic framework that is based on cadmium ions and multi carboxylate ligands, namely, Na 0.25 [(CH 3 ) 2 NH 2 ] 1.75 [Cd(L) 2 ] ⋅ x solvent ( 1 , H 2 L=2‐hydroxymethyl‐4,6‐bi(2′‐methoxyl‐4′‐(2′′‐1′′‐carboxyl)‐ethlene)‐1,3,5‐mesitylene), has been successfully synthesized under solvothermal conditions. Compound 1 exhibits a 2D network that is constructed from left‐ and right‐handed helical chains. Furthermore, neighboring 2D layers are stacked to give a porous motif. Strikingly, compound 1 exhibits the highly efficient exchange of metal ions from the main framework components whilst maintaining the structural integrity and the crystallinity of the network. In addition, Compound 1 also shows outstanding performance in the reversible adsorption of iodine.