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One Coordination Cage, Many Pathways: Multiple Stimuli Drive Reversible Transformations.

Romain Guechaichia1, Amina Benchohra1,2, Liam Miller1

  • 1Univ Angers, CNRS, MOLTECH-ANJOU, F-49000 Angers, France.

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Summary
This summary is machine-generated.

Researchers created a versatile coordination cage using rhodium complexes and a triazatruxene ligand. This molecular cage can reversibly change between four distinct structures in response to concentration, guest, and pH stimuli.

Keywords:
coordination cagespHself-assemblystimuli-induced transformationstriazatruxene

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Self-assembly of coordination cages is a key strategy in supramolecular chemistry.
  • Designing cages with tunable properties and responsiveness is an ongoing challenge.
  • Triazatruxene ligands offer a rigid, planar platform for constructing complex architectures.

Purpose of the Study:

  • To construct a novel trigonal prismatic coordination cage with a large cavity.
  • To investigate the stimulus-responsive structural transformations of the cage.
  • To explore the cage's capabilities in guest encapsulation and interlocked structures.

Main Methods:

  • Self-association of a bis-(rhodium) complex with a triazatruxene ligand.
  • Manipulation of external stimuli: cage concentration, guest identity, and pH.
  • Characterization using NMR spectroscopy, mass spectrometry, theoretical calculations, and X-ray diffraction.

Main Results:

  • Formation of a trigonal prismatic coordination cage with a large internal cavity.
  • Demonstration of four interconvertible stable structures: monomeric cage, two host-guest complexes, and a cage dimer.
  • Observation of selective double guest encapsulation, stimulus-controlled catenation, and pH-triggered guest exchange.

Conclusions:

  • The developed coordination cage exhibits remarkable structural versatility and responsiveness.
  • The cage enables on-demand formation of discrete structures and mechanically interlocked architectures.
  • This work presents a unique molecular building block with potential applications in molecular machines and sensing.