Halide-triggered assembly and selective bisulfate recognition in a quadruply interlocked coordination cage.

Interlocked coordination cages are a class of multi-cavity architectures with applications in selective anion recognition, adaptive sensing, and catalysis. Controlling the partitioning of their cavities through ligand design and appropriate anion templates is critical to their guest binding scope, yet remains a challenge. Here, we present a thermodynamically stable [PdL](BF) cage assembled from a bis-monodentate ligand featuring a non-coordinating bis-pyrazole methane backbone.