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Dual-controlled guest release from coordination cages.

Yuqing YaoChengyuan ShaoShuwei WangQiufang GongJia LiuHua JiangYing Wang
Published in: Communications chemistry (2024)
Despite having significant applications in the construction of controlled delivery systems with high anti-interference capability, to our knowledge dual-controlled molecular release has not yet been achieved based on small molecular/supramolecular entities. Herein, we report a dual-controlled release system based on coordination cages, for which releasing the guest from the cage demands synchronously altering the coordinative metal cations and the solvent. The cages, Hg 5 L 2 and Ag 5 L 2 , are constructed via coordination-driven self-assembly of a corannulene-based ligand. While Hg 5 L 2 shows a solvent-independent guest encapsulation in all the studied solvents, Ag 5 L 2 is able to encapsulate the guests in only some of the solvents, such as acetone-d 6 , but will liberate the encapsulated guests in 1,1,2,2-tetrachloroethane-d 2 . Hg 5 L 2 and Ag 5 L 2 are interconvertible. Thus, the release of guests from Hg 5 L 2 in acetone-d 6 can be achieved, but requires two separate operations, including metal substitutions and a change of the solvent. Dual-controlled systems as such could be useful in complicated molecular release process to avoid those undesired stimulus-responses.
Keyphrases
  • ionic liquid
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