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Researchers created large, double-shell supramolecular cages using metal-organic self-assembly. These cage-in-cage structures mimic virus capsids and offer potential for molecular recognition and delivery applications.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Nanosized cage-within-cage compounds are advanced 3D architectures.
  • Synthesizing multilayered, ultralarge cages mimicking virus capsids is challenging.

Purpose of the Study:

  • To synthesize novel, large double-shell supramolecular cages.
  • To explore facile self-assembly of metal-organic ligands and metal ions.
  • To create models for functional recognition, delivery, and detection.

Main Methods:

  • Facile self-assembly of metal-organic hexatopic terpyridine ligands with metal ions.
  • Utilized redesigned ligands with high geometric constraints for exclusive double-shell formation.
  • Characterization via 1H NMR, DOSY, ESI-MS, TWIM-MS, TEM, AFM, and SAXS.

Main Results:

  • Successfully synthesized two large double-shell supramolecular cages.
  • Cages feature inner cubes (5.1 nm) and outer truncated cubes (12.0 and 13.2 nm).
  • Achieved high molecular weights (75,232 and 77,667 Da), among the largest reported synthetic cage-in-cage structures.

Conclusions:

  • Demonstrated exclusive formation of discrete double-shell structures through ligand design.
  • The synthesized cages serve as excellent models for supramolecular materials.
  • Highlights potential for guest molecule recognition, delivery, and detection.