Photoswitching Lewis Acid Catalysis with Highly Fatigue Resistant Photochromic Boronates

Area of Science:

• Catalysis
• Materials Science
• Organic Chemistry

Background:

• Photoswitchable molecules offer dynamic control over chemical processes.
• Lewis acids are crucial catalysts but often lack reversible control mechanisms.
• Diarylethene-based systems are known for their photochromic properties.

Purpose of the Study:

• To introduce novel, fatigue-resistant photoswitchable Lewis acids based on diarylethene-functionalized boronates.
• To elucidate the impact of substituent patterns on photoswitching performance.
• To demonstrate tunable on/off control in Lewis acid catalysis via photoisomerization.

Main Methods:

• Synthesis of diarylethene-functionalized boronates.
• Characterization of photoswitching properties and fatigue resistance.
• Application of global and effective Lewis acidity (gLA and eLA) frameworks.
• Investigation of Lewis acid-base association thermodynamics and substrate activation.

Main Results:

• Diarylethene-functionalized boronates exhibit high fatigue resistance.
• Substituent patterns significantly influence photoswitching ability and Lewis acidity.
• Tunable affinity amplitudes allow for effective on/off control of catalysis.
• Photoisomerization modulates Lewis acid-base interactions and substrate activation.
• Reversible photoisomerization enables the generation of out-of-equilibrium states.

Conclusions:

• Photoswitchable boronates represent a promising new class of catalysts with tunable properties.
• The developed system offers precise control over Lewis acid catalysis through light.
• These findings open avenues for advanced functional materials and photochemical applications.