Light driven molecular lock comprises a Ru(bpy)₂(hpip) complex and cucurbit[8]uril.

Area of Science:

• Supramolecular Chemistry
• Photochemistry
• Materials Science

Background:

• Ruthenium complexes and cyclodextrins are key components in supramolecular chemistry.
• Photo-responsive systems offer dynamic control over molecular assembly.

Purpose of the Study:

• To develop a photo-driven supramolecular machine.
• To investigate the formation of a reversible "lock" system using a ruthenium complex and cyclodextrin.

Main Methods:

• Formation of a 1:1 inclusion complex between complex 1 ([Ru(bpy)2(hpip)]2+-MV2+) and CB[8] in aqueous solution.
• Photo-irradiation to induce reversible locking via MV radical dimer formation.
• Structural analysis of the U-shaped and interlocked conformations.

Main Results:

• A stable 1:1 inclusion complex with a U-shaped conformation was formed.
• Light irradiation induced reversible locking of two complex 1 units within CB[8].
• A MV radical dimer, stabilized by Ru complexes, formed the interlocked structure.

Conclusions:

• A feasible strategy for fabricating a photo-driven supramolecular machine was demonstrated.
• The system functions as a light-activated "lock" with reversible conformational changes.
• This work advances the design of responsive supramolecular architectures.