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Visible light activated energy storage in solid-state Azo-BF2 switches.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Organic Chemistry

Background:

  • Azo-BF2 photoswitches can store and release energy via visible light.
  • Planar structures and large pi-conjugation hinder E-Z isomerization in compacted states.
  • Solid-state switching is crucial for molecular solar thermal energy storage.

Purpose of the Study:

  • To overcome the isomerization limitations of planar Azo-BF2 photoswitches in the solid state.
  • To investigate the effect of aliphatic functionalization on Azo-BF2 photoswitch performance.
  • To explore new photoswitch candidates for molecular solar thermal energy storage.

Main Methods:

  • Synthesized Azo-BF2 photoswitches with one or two aliphatic substituents.
  • Analyzed the structural and conformational changes induced by functionalization.
  • Evaluated the E-Z isomerization efficiency in the solid phase.

Main Results:

  • Aliphatic substitution altered intermolecular interactions and photochrome arrangement.
  • The derivative with two substituents adopted a non-planar configuration.
  • This non-planar structure provided conformational freedom for efficient solid-state E-Z isomerization.

Conclusions:

  • Double aliphatic functionalization is a viable strategy to enhance solid-state switching of large aromatic photoswitches.
  • This approach significantly improves the potential of Azo-BF2 derivatives for molecular solar thermal energy storage.
  • The findings open avenues for designing novel photoswitches for energy applications.