Photochemical transformations, including [2+2] photo-cycloaddition of donor-acceptor stilbenes and photoswitching of azobenzenes, enable the storage of solar photon energy in strained chemical bonds. The stored photon energy can be released upon triggering as thermal energy. This process is termed molecular solar thermal (MOST) energy storage, which opens up fascinating avenues in capturing solar energy, storing thermal energy, and diverse renewable heating applications. We investigate in the design of new photochemical reactions and the mechanistic understanding of the light-induced bond formations and structural changes in solids.
Light-responsive soft matter can exhibit interesting phase transitions between crystalline solid and liquid states. Our inquiries are centered on:
- How can we design photo-switching molecules that overcome steric hindrance in solids and undergo structural isomerization?
- Is it possible to utilize these phase transitions to manage the storage and discharge of latent heat?
Photo-induced changes in intermolecular interactions can influence the solubility of substances in organic solvents. We employ this fascinating characteristic of photoswitching molecules to selectively activate and recover chemicals via light irradiation. This represents a substantial advancement in recycling industrial chemicals, like homogeneous catalysts, which are costly but often discarded after one use. Our studies show approximately 90% catalyst recovery post-reactions and the continual use of these reclaimed catalysts.
Han Group 