172612-63-4Relevant academic research and scientific papers
Photochromism of Dithienylethenes with Electron-Donating Substituents
Irie, Masahiro,Sakemura, Kazuyuki,Okinaka, Masakazu,Uchida, Kingo
, p. 8305 - 8309 (2007/10/03)
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 ε 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 coefficient and to decrease the ring-opening quantum yield.The cyclization quantum yield was scarely affected by the substitution.The conversion from the open- to the closed-ring forms of the diethylamino-substituted compound in the photostationary state under irradiation with 313 nm light was close to 100percent.
