Received 28 August 2013
aDepartment of Materials Science, School of Engineering, The University of Shiga Prefecture, 2500 Hassaka-cho, Hikone, Shiga 522-8533, Japan, and bDepartment of Materials Science and Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
Correspondence e-mail: firstname.lastname@example.org
The asymmetric unit of the title compound, C14H6O4, contains three independent molecules (A, B and C). In molecule C, there are two disordered sets of two carbonyl O atoms [occupancies = 0.643 (11) and 0.357 (11)]. All three molecules are non-planar due to repulsion between two O atoms in peri positions on the anthracene ring, showing a slight difference in deviation of the carbonyl O atoms. The intramolecular distances between the two nearest O atoms are in the range of 2.685 (10)-2.766 (10) Å. In the crystal, molecules are linked by C-HO and - [centroid-centroid distances = 3.615 (2), 3.844 (2) and 3.921 (2) Å] interactions, which lead to the formation of a herringbone-like arrangement.
For the synthesis of the title compound, see: Yoshino et al. (1981). For applications of 1,4,9,10-anthracenetetraone (quinizarindiquinone) derivatives, see: Isikli & Díaz (2012); Adeva et al. (1997); Jin et al. (1998).
Data collection: PROCESS-AUTO (Rigaku, 1998); cell refinement: PROCESS-AUTO; data reduction: PROCESS-AUTO; program(s) used to solve structure: SIR2004 (Burla et al., 2005); program(s) used to refine structure: SHELXL2013 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and Mercury (Macrae et al., 2008); software used to prepare material for publication: WinGX (Farrugia, 2012).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: VM2198 ).
This work was supported by a Grant-in-Aid for Scientific Research (C) (No. 23550161) from the JSPS.
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