Selective Anion Exchange and Tunable Luminescent Behaviors of Metal–Organic Framework Based Supramolecular Isomers

Owing to the conformational (cis or trans) flexibility of a N-donor ligand, the combinations of the same and Cd­(ClO₄)₂ under variable solvent templates afforded two supramolecular isomers based on two-dimensional metal–organic frameworks. Both compounds contain weakly coordinating ClO₄^– anions attached to the metal centers. Both frameworks showed facile anion exchange behaviors with various kinds of foreign anions. Moreover, both frameworks showed anion-driven structural dynamism and exhibited the preferential uptake of strongly coordinating anions over others. Anion-regulated modulation in luminescent behaviors was also observed in both cases

Dynamic Metal–Organic Framework with Anion-Triggered Luminescence Modulation Behavior

A three-dimensional cationic framework based on a flexible neutral nitrogen-donor ligand was synthesized and undergoes guest-driven structural dynamics in a reversible way. Size-selective anion-exchange and tunable luminescent behavior of the framework has been explored