Acta Cryst. (2005). E61, o4077-o4079  [ doi:10.1107/S1600536805036512 ]

1,2-Bis[5-(2,2-dicyanovinyl)-2-ethyl-3-thienyl]-3,3,4,4,5,5-hexafluorocyclopent-1-ene, a new photochromic diarylethene compound

S.-Z. Pu, T.-S. Yang, R.-J. Wang and J.-K. Xu

Abstract: The title compound, C₂₅H₁₄N₄F₆S₂, is a new symmetric photochromic diarylethene which can potentially be applied in optoelectronic devices, such as optical memories, photo switches, and color displays. In the crystalline phase, this molecule, which has crystallographic twofold rotation symmetry, adopts an antiparallel conformation that can undergo effective photocyclization reactions by a conrotatory mechanism. The distance between the two reactive C atoms is 3.642 (7) Å. The dihedral angle between the central cyclopentene ring and each thiophene ring is 48.0 (2)°. The colourless crystals turn green when exposed to UV radiation and the process is reversible when exposed to visible light of appropriate wavelength.

Online 10 November 2005

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