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Dithienylethene-based supramolecular chiroptical switch in phosphate-coordination-driven 2 : 2 duplexes.

Mengxue Lu1, Xiao-Wen Sun1, Ji Wang1

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Researchers developed a novel supramolecular chiroptical switch using dithienylethene photoswitches. This system exhibits reversible switching between a circular dichroism silent state and a chiral, light-responsive state.

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Area of Science:

  • Supramolecular Chemistry
  • Photochemistry
  • Chiroptical Materials

Background:

  • Dithienylethene photoswitches are known for chirality and optical activity.
  • These properties offer potential in various applications.
  • Developing controllable chiroptical systems remains an active research area.

Purpose of the Study:

  • To design and investigate a new dithienylethene-based supramolecular chiroptical switch.
  • To explore phosphate coordination as a driving force for the switch.
  • To demonstrate reversible chiroptical switching behavior.

Main Methods:

  • Synthesis of a dithienylethene-based supramolecular system.
  • Photoisomerization of dithienylethenes between open-ring and closed-ring forms.
  • Circular dichroism (CD) spectroscopy to monitor chiroptical properties.
  • Phosphate coordination studies.

Main Results:

  • The open-ring form adopted a mesocate structure, showing no circular dichroism (CD silent).
  • Photoisomerization to the closed-ring form induced a structural transition to a chiral helicate.
  • The closed-ring form exhibited a significant turn-on of CD signals.
  • Reversible switching between the two states was achieved.

Conclusions:

  • A novel supramolecular chiroptical switch based on dithienylethenes and phosphate coordination was successfully developed.
  • The system demonstrates efficient and reversible light-driven switching between CD-silent and CD-active states.
  • This work expands the toolkit for designing advanced chiroptical materials and molecular switches.