(IUCr) Crystallography Journals Online

[Contents scheme]

Acta Cryst. (2005). E61, o1930-o1932 [ doi:10.1107/S1600536805016636 ]

The triclinic form of 2,9-dichloro-5,12-dihydroquino[2,3-b]acridine-7,14-dithione dimethylacetamide disolvate

T. Senju, T. Hoki and J. Mizuguchi

Abstract: The title compound, C₂₀H₁₀Cl₂N₂S₂·2C₄H₉NO, is a dimethylacetamide (DMA) disolvate of DTQ-Cl, which is a thionated derivative of a 2,9-dichloroquinacridone pigment. The compound shows polymorphism and this paper reports the triclinic form (space group P $\overline{1}$ , Z = 1). The DTQ-Cl molecule is centrosymmetric and planar, while the DMA molecule is orientationally disordered. Two symmetry-related DMA molecules are hydrogen bonded via their O atoms to the NH groups of DTQ-Cl. The molecular plane of DMA is twisted with respect to the DTQ-Cl skeleton by 73.6 (1)°.

Online 31 May 2005