Anthracene-1,4,9,10-tetra-one.
The asymmetric unit of the title compound, C14H6O4, contains three independent mol-ecules (A, B and C). In mol-ecule C, there are two disordered sets of two carbonyl O atoms [occupancies = 0.643 (11) and 0.357 (11)]. All three mol-ecules 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 intra-molecular distances between the two nearest O atoms are in the range of 2.685 (10)-2.766 (10) Å. In the crystal, mol-ecules are linked by C-H⋯O and π-π [centroid-centroid distances = 3.615 (2), 3.844 (2) and 3.921 (2) Å] inter-actions, which lead to the formation of a herringbone-like arrangement.
Department of Materials Science, School of Engineering, The University of Shiga Prefecture, 2500 Hassaka-cho, Hikone, Shiga 522-8533, Japan.
Chitoshi
C
Kitamura
Department of Materials Science and Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan.
Takeshi
T
Kawase