Photo-controllable binding and release of HP₂O₇^3- using an azobenzene based smart macrocycle

Area of Science:

• Supramolecular Chemistry
• Photochemistry
• Analytical Chemistry

Background:

• Azobenzene-based macrocycles are valuable for molecular recognition.
• Photo-switchable systems offer dynamic control over binding events.
• Selective detection of anions like pyrophosphate is crucial in various fields.

Purpose of the Study:

• To synthesize and characterize a novel azobenzene-containing macrocycle.
• To investigate the photoisomerization behavior of the macrocycle.
• To evaluate the macrocycle's ability for photo-controllable recognition of pyrophosphate ions.

Main Methods:

• Design and synthesis of azobenzene-bearing macrocycle 1.
• Photoirradiation studies to induce trans-cis isomerization.
• Binding studies to assess pyrophosphate ion recognition.
• Spectroscopic techniques for characterization.

Main Results:

• The synthesized macrocycle 1 undergoes 100% trans-to-cis photoisomerization upon irradiation.
• The macrocycle exhibits selective binding towards pyrophosphate (HP2O73-).
• Binding and release of pyrophosphate are reversibly controlled by photoirradiation.

Conclusions:

• A novel photo-switchable macrocycle has been successfully synthesized.
• The macrocycle demonstrates efficient and reversible photo-controlled recognition of pyrophosphate.
• This system offers potential for light-actuated sensing and separation technologies.