Upon exposure to light, the spirooxazine and naphthopyran units undergo photochemical reactions leading to isomerization or cyclization, resulting in a change in their electronic structure. The ethylenic bridge plays a role in mediating the photochemical processes between the two chromophores, leading to unexpected and possibly unique behaviors not observed in the individual photochromic units. The overall photochemical behavior of the biphotochromic system can be influenced by factors such as the nature of the ethylenic bridge, substituents on the chromophores, and the wavelength and intensity of the incident light.
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3,3-diphenyl-8-hydroxymethyl-[3H]-naphthol[2,1-b]pyran
dianthrene
