Bis (2, 4-dimethyl-5-phenylthiophene-3-yl) perfluorocyclopentenes having hydrogen, methoxy, diethylamino, or cyano substituents at para-positions of the phenyl groups were synthesized to reveal the effect of the substitution on the absorption coefficient E of the closed-ring forms and the photochemical reactivity. Electron-donating substituents, such as methoxy or diethylamino groups, were found to be effective to increase the absorption ...
![3-[2-(2,4-dimethylthiophen-3-yl)-3,3,4,4,5,5-hexafluorocyclopenten-1-yl]-2,4-dimethylthiophene Structure](https://image.chemsrc.com/caspic/411/170658-51-2.png)
