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Area of Science:

  • Supramolecular Chemistry
  • Organic Synthesis
  • Photochemistry

Background:

  • Tetraureacalix[4]arenes are macrocyclic compounds known for their ability to form host-guest complexes.
  • Azobenzene derivatives are photoresponsive molecules that undergo reversible E/Z isomerization upon light irradiation.

Purpose of the Study:

  • To synthesize novel tetraureacalix[4]arenes functionalized with azobenzene groups.
  • To investigate the light-induced self-assembly and cargo release behavior of these azobenzene-containing macrocycles.

Main Methods:

  • Synthesis of tetraureacalix[4]arenes with terminal azobenzene units.
  • Spectroscopic analysis (NMR, UV-Vis) to characterize the compounds and their complexes.
  • Photochemical studies to monitor isomerization and cargo release dynamics.

Main Results:

  • Quantitative dimerization of all-trans tetraureas in solution to encapsulate tetramethylphosphonium (Me4P+) cations.
  • Light-induced isomerization to cis-enriched forms, leading to reduced cavity size and partial release of Me4P+.
  • Demonstrated control over cargo release (up to 70%) by modifying azobenzene substituents, with no photodegradation observed over multiple cycles.

Conclusions:

  • Azobenzene-functionalized tetraureacalix[4]arenes act as photo-switchable host molecules.
  • The degree of cargo release can be precisely tuned by structural modifications of the azobenzene units.
  • These systems offer potential for developing light-controlled molecular switches and drug delivery systems.