Acta Crystallographica Section C

Crystal Structure Communications

Volume 60, Part 2 (February 2004)

Acta Cryst. (2004). C60, o146-o148 [doi:10.1107/S0108270103026775]

Monitoring structural transformations in crystals. 7. 1-Chloroanthracene and its photodimer

I. Turowska-Tyrk and K. Grzesniak

Abstract: Crystals of the 1-chloroanthracene photodimer, viz. trans-bi(1-chloro-9,10-dihydro-9,10-anthracenediyl), C₂₈H₁₈Cl₂, were obtained from the solid-state [4+4]-photodimerization of the monomer, C₁₄H₉Cl, followed by recrystallization. The symmetry of the product molecules is defined by the orientation of the reactant molecules in the crystal. The mutual orientation parameters calculated for adjacent monomers explain the reactivity of the compound. The molecules in the crystal of the monomer and the recrystallized photodimer pack differently and the photodimer has crystallographically imposed inversion symmetry.

Formula: C₁₄H₉Cl and C₂₈H₁₈Cl₂

Online 31 January 2004


	Structure factor file (CIF format) (97.9 kbytes) Contains datablock I

	Structure factor file (CIF format) (95.8 kbytes) Contains datablock II

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