Rational Molecular Design of Germole-Fused Dithienylethenes with Tunable Photochromic Response, Reaction Pathway, and...

Area of Science:

• Materials Science
• Organic Chemistry
• Photochemistry

Background:

• Photoswitchable molecules are crucial for advanced optical applications.
• Dithienylethenes are well-known photochromic compounds.
• Organogermanium compounds offer unique electronic properties.

Purpose of the Study:

• To design and synthesize novel photoswitchable organogermanium compounds.
• To investigate the photochromic properties of germole-fused dithienylethenes.
• To evaluate their potential as stable and efficient photoswitches.

Main Methods:

• Synthesis of germole-fused dithienylethene derivatives.
• Photochromic performance evaluation in solution and thin films.
• Assessment of photostability, thermal stability, and switching efficiency.

Main Results:

• Successful synthesis of new photoswitchable organogermanium compounds.
• Tunable optical band gaps leading to distinct photochromic responses.
• Robust photofatigue resistance (12 cycles) and excellent thermal irreversibility (half-life up to 33 days at 100 °C).
• High photoswitching efficiencies with up to 85% conversion at photostationary state.

Conclusions:

• Germole-fused dithienylethenes represent a promising class of photoswitchable materials.
• These compounds exhibit superior stability and efficiency for photoswitching applications.
• The rational design allows for fine-tuning of photochromic properties.