Turowska-Tyrk Ilona, Grześniak Karolina
Department of Chemistry, Wrocław University of Technology, Wybrzeze Wyspiańskiego 27, 50-370 Wrocław, Poland.
Acta Crystallogr C. 2004 Feb;60(Pt 2):o146-8. doi: 10.1107/S0108270103026775. Epub 2004 Jan 31.
Crystals of the 1-chloroanthracene photodimer, viz. trans-bi(1-chloro-9,10-dihydro-9,10-anthracenediyl), C(28)H(18)Cl(2), were obtained from the solid-state [4+4]-photodimerization of the monomer, C(14)H(9)Cl, 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.
