[Retracted] Innovative Application of Nano-Organic Photochromic New Materials in Hakka Traditional Decorative Pattern Design

Table 5

Principle of organic photochromism.

Representative compound	metachromatic principle
Azobenzene, indigo, styrene, benzylidene aniline, etc	Photoisomerization (cis-trans isomerization)
Spiropyran, hydrosperic anhydride, spirothiran, spiroperazine and their derivatives	A vision of the key
Bis - tetraphenyl pyrrole, tetrachloronaphthalene, hexaphenyl ethane, hexaphenyl bis imidazoles, hydrazine and other symmetrical compounds	Homolytic cleavage of bonds (free radical formation or dissociation)
Thick ring aromatic compounds, anthraquinone, violet essence compounds, thiazobenzene derivatives, violet protochrome, tetraphenylhydrazine and other compounds	redox reaction
Anhydride and its derivatives, aryl and pyran, diaryl ethylenes, aryl and oxazines, etc	pericyclic reaction
Salicylaldehydes anilines (Schiff bases)	Proton transfer
Aryl naphthalene and naphthalene quinones	Aryl migration