Inside Back Cover: Dynamic Open Coordination Cage from Nonsymmetrical Imidazole–Pyridine Ditopic Ligands for Turn-On/Off Anion Binding (Angew. Chem. Int. Ed. 51/2019)

Nonsymmetrical ligands are usually not considered building blocks for discrete self-assembled products. In their Communication on page 18424, J. Yuasa and D. Ogata employ a new imidazole/pyridine-based ditopic ligand as a building block for a dynamic Pd₂L₄ open cage compound that is available for turn-on/off anion binding through stoichiometry-driven structural transitions.