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Dynamic Interconversion and Induced-Fit Guest Binding with Two Macrocycle-Based Coordination Cages.

Zi-Jun Xia1,2, Ying-Mei Zhong1, Shao-Jun Hu1

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Summary
This summary is machine-generated.

Researchers created two interconvertible coordination cages, Pd2L2 and Pd1L1, using a dynamic macrocycle ligand and palladium units. These cages can bind polycyclic aromatic hydrocarbon guests, demonstrating a new strategy for responsive supramolecular hosts.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Dynamic macrocyclic ligands offer versatile platforms for constructing complex supramolecular architectures.
  • Coordination self-assembly is a powerful method for creating well-defined host molecules.
  • Controlling the assembly of dynamic systems is crucial for developing responsive materials.

Purpose of the Study:

  • To synthesize and characterize two interconvertible coordination cages, Pd2L2 and Pd1L1.
  • To investigate the host-guest chemistry of these cages with polycyclic aromatic hydrocarbon (PAH) guests.
  • To demonstrate a strategy for designing multistimuli-responsive supramolecular hosts.

Main Methods:

  • Synthesis of a dynamic macrocyclic ligand (L) via pyridinium bonds.
  • Coordination self-assembly using the macrocyclic ligand and a cis-blocking palladium(II) complex.
  • Selective cage formation by controlling reaction conditions (concentration, solvent, temperature).
  • Induced-fit guest encapsulation to control cage assembly.
  • X-ray crystallography to determine structures of the free ligand and host-guest complexes.

Main Results:

  • Successful synthesis of two interconvertible coordination cages, Pd2L2 and Pd1L1.
  • The macrocyclic ligand L binds PAH guests in its cis-conformation.
  • Selective formation of individual cages achieved by tuning reaction parameters or using guest-induced fit.
  • Direct assembly yielded an equilibrium mixture of Pd2L2 and Pd1L1 cages.
  • X-ray structures confirmed ligand conformational changes and adaptive cavity formation upon guest encapsulation.

Conclusions:

  • A strategy for designing multistimuli-responsive supramolecular hosts using dynamic macrocyclic ligands was demonstrated.
  • The interconvertible coordination cages exhibit adaptive behavior influenced by reaction conditions and guest binding.
  • This work provides insights into controlling self-assembly processes for creating functional supramolecular materials.