Experimental Crystal data

R factor = 0.039; wR factor = 0.104; data-to-parameter ratio = 23.1. The title compound, C20H10Cl2N2, has crystallographic twofold rotational symmetry [maximum deviation from the least-squares plane = 0.038 (1) Å]. In the crystal, weak – ring stacking interactions occur down the a-axis direction [minimum centroid–centroid separation = 3.7163 (8) Å]. Related literature For the synthesis of the title compound, see: Bellizzi et al. (2006). For the structures of similar compounds, see: Bellizzi et al. (2006); Day et al. (2002); Richards et al. (2009)