title: 1,2-Bis[5-(1,3-dioxolan-2-yl)-2-ethyl-3-thienyl]-3,3,4,4,5,5-hexafluorocyclopent-1-ene, a photochromic dithienylethene.
abstract: The title compound, C23H22F6O4S2, a photochromic dithienylethene, is a promising material for optical storage and other optoelectrical devices. The molecule adopts a photoactive antiparallel conformation in the crystalline state. The distance between the two reactive C atoms which are involved in potential ring closure is 3.829 (4) A. The dihedral angles between the central cyclopentene ring and the adjacent thiophene rings are 55.38 (7) and 54.81 (9) degrees. The colourless crystals turn magenta when exposed to UV radiation and the process is reversible.
authors.affiliation: Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, People's Republic of China. pushouzhi@tsinghua.org.cn
authors.forename: Shou-Zhi
authors.initials: SZ
authors.lastname: Pu
authors.forename: Tian-She
authors.initials: TS
authors.lastname: Yang
authors.forename: Ru-Ji
authors.initials: RJ
authors.lastname: Wang
authors.forename: Jing-Kun
authors.initials: JK
authors.lastname: Xu