Photoswitches beyond azobenzene: a beginner's guide.

Area of Science:

• Photochemistry
• Organic Chemistry
• Materials Science

Background:

• Photoswitches are molecules that change properties upon light irradiation.
• Azobenzene is a well-known photoswitch, but other classes offer unique tunable characteristics.
• Understanding diverse photoswitch classes is crucial for advancing molecular technologies.

Purpose of the Study:

• To provide a comprehensive tutorial on photoswitches for students and researchers.
• To introduce key terminology, synthesis, switching mechanisms, and properties of various photoswitch classes.
• To highlight photoswitch alternatives to azobenzene for specialized applications.

Main Methods:

• Literature review and synthesis of existing knowledge on photoswitches.
• Detailed explanation of terminology and concepts in photoswitch research.
• Comparative analysis of seven distinct photoswitch classes: azoheteroarenes, diazocines, indigoid photoswitches, arylhydrazones, diarylethenes, fulgides, and spiropyrans.

Main Results:

• Azobenzene is not the only photoswitch; several other classes exhibit valuable and tunable properties.
• Seven specific photoswitch classes (azoheteroarenes, diazocines, indigoid photoswitches, arylhydrazones, diarylethenes, fulgides, spiropyrans) are detailed.
• The review covers synthesis routes, light-induced switching mechanisms, and characteristic properties for each class.

Conclusions:

• This review serves as an accessible entry point into the diverse world of photoswitches.
• It empowers readers to select and utilize appropriate photoswitch classes based on specific requirements.
• Exploring photoswitches beyond azobenzene opens new avenues for molecular design and functional materials.