title: 5-n-Butyl-4-[2-(2-ethyl-1-benzothio-phen-3-yl)-3,3,4,4,5,5-hexa-fluoro-cyclo-pent-1-en-1-yl]thio-phene-2-carbaldehyde.
abstract: The title compound, C(24)H(20)F(6)OS(2), exhibiting photochromic behaviour, has thienyl and benzothienyl substituents attached to the double-bond C atoms of the envelope-shaped cyclo-pentene ring. The mean planes of aromatic systems form dihedral angles of 43.0 (1) (thien-yl) and 73.8 (1)° (benzothien-yl) with the mean plane of the C-C=C-C portion of the cyclo-pentene ring. This conformation avoids steric hindrance between the n-butyl and ethyl substituents. The formyl substituent of the thienyl group, as well as the ethyl substituent of the benzothienyl group, are disordered [occupancies of 0.788 (17):0.212 (17) and 0.64 (5):0.36 (5), respectively].
authors.forename: Zhen
authors.initials: Z
authors.lastname: Yang
authors.forename: Congbin
authors.initials: C
authors.lastname: Fan
authors.forename: Min
authors.initials: M
authors.lastname: Li
authors.forename: Weijun
authors.initials: W
authors.lastname: Liu
authors.forename: Gang
authors.initials: G
authors.lastname: Liu
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng