Manipulation of Chemistry and Biology with Visible Light Using Tetra-ortho-Substituted Azobenzenes and Azonium Ions.

Summary: Imagine having a tiny remote control that can turn medicines or smart materials on and off using just a flash of light! Scientists are making this a reality using special light-activated molecules called "photoswitches." The newest versions of these switches (called azobenzenes and azonium ions) are amazing because they work with safe, visible light that can even pass through our skin without causing damage. For a long time, these complex molecules were hard to make, but researchers have finally cracked the code. This review explains how scientists build these tiny light switches, how they work, and how they can be used to create next-generation materials and new medical treatments.