Research Progress on Photochromic Spiropyrans in the Solid State
In recent years,organic photochromic materials have drawn continuous interest due to their wide application value in fields such as molecular switches,anti-counterfeiting and biological fluorescence imaging.Spiropyran(SP)compounds have the advantages of simple preparation,easy modification and good optical properties.They can undergo structural and performance changes under various external stimuli such as light,heat,electricity,acid-base,and external forces.Therefore,they can be applied in multiple fields.Solid spiropyran compounds without a matrix are difficult to undergo photochromic reactions due to their tightly packed molecules and lack of spatial free volume.Development of photochromic SP in the solid state is a significant trend in new materials.The research progress on photochromic spiropyrans in the solid state is summa-rized with the relationship between molecular structures and properties as an emphasis.
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