2,6-Dimeth-oxy-9,10-anthraquinone.

ABSTRACT: The title compound, C(16)H(12)O(4), crystallizes with two half-mol-ecules in the asymmetric unit, each of which is completed by a crystallographic inversion center. The two crystallographically independent mol-ecules have almost the same geometry and are almost planar [maximum deviations = 0.018?(3) and 0.049?(3)?Å]. They adopt a conformation in which the C(meth-yl)-O bonds are directed along the mol-ecular short axis [C-C-O-C torsion angles of 179.6?(2) and 178.0?(2)°]. In the crystal, the mol-ecular packing is characterized by a combination of a columnar stacking and a herringbone-like arrangement. The mol-ecules form slipped ?-stacks along the b axis, in which there are two kinds of columns differing from each other in their slippage. The inter-planar distances between neighboring mol-ecules are 3.493?(3) for one column and 3.451?(2)?Å for the other.

SUBMITTER: Ohta A 

PROVIDER: S-EPMC3470203 | biostudies-other | 2012 Oct

REPOSITORIES: biostudies-other