Fatigue-resistant photochromic dithienylethenes by controlling the oxidation state

High fatigue-resistant photochromic dithienylethenes were synthesized by controlling the oxidation state of 1,2-bis( 2-methyl-1-benzothiophene-3-yl) perfluorocyclopentene ( BTF6) and 1,2-bis( 2,5-dimethylthien-3-yl) perfluorocyclopentene ( DMTF6).