Most spiropyran compounds are soluble in organic solvents and insoluble in water,which limit the researchs and applications.Thus,it is necessary to enhance the water solubility of these compounds.The water-soluble spiropyran compounds can be prepared through introducing hydrophilic groups into their molecule structures,modifying water-soluble macromolecules with spiropyran compounds or copolymerizing vinyl spiropyran compounds with water-soluble monomers.The research progress in synthesis of the compounds was reviewed.
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