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.