Abstract
A new class of photochromic diarylethenes with an indazole moiety has been firstly synthesized, and their photochromic and fluorescence properties have been investigated. The indazole moiety was connected directly to the central cyclopentene ring as one heteroaryl unit and availably participated in the photoinduced cyclization reaction in solution, amorphous film, as well as in the crystalline phase. These diarylethenes exhibited excellent photochromism with good thermal stability and remarkable fatigue resistance. They also functioned as notable fluorescence switches in both solution and amorphorous films. In addition, the different substituents at the para-position of the terminal benzene ring had a significant effect on their properties: the electron-donating methoxy group could enhance the quantum yields of cyclization and cycloreversion and fluorescence quantum yield, but the electron-withdrawing trifluoromethyl had opposite effect.
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