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. As a result of its idealized dimensions, NMR, ESI-MS, and X-ray analyses reveal that halides can trigger the interpenetration of this cage into a [X@PdL] dimer (X = Cl or Br) where the halide template resides only in the central pocket. The anion-cation pattern of this interlocked host facilitates exceptional binding affinity for the bisulfate anion in its two outer pockets (up to 10 M in MeCN), strongly outcompeting other tetrahedral anions of similar size.
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| http://dx.doi.org/10.1039/d4sc04913f | DOI Listing |
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Article Synopsis
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- When mixed together, these ligands create an octa-cationic 2-catenane that can change form based on the presence of a di-anionic guest molecule.
- The research establishes a method for switching between different complex forms (2-catenane and macromonocyclic rings) by manipulating guest binding and using anion interactions.
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