(IUCr) Crystallography Journals Online

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Acta Cryst. (2006). E62, o261-o263 [ doi:10.1107/S1600536805039863 ]

3,10-Dichloro-5,12-dihydroquino[2,3-b]acridine-7,14-dione

T. Senju, T. Hoki and J. Mizuguchi

Abstract: The title compound, C₂₀H₁₀Cl₂N₂O₂, is one of the quinacridone derivatives known as red pigments. The molecule has inversion symmetry. The quinacridone molecules are connected by N-HO hydrogen bonds along the [1 $\overline{1}$ 0] direction to form a ribbon structure.