6,8-Di-chloro-4-oxochromene-3-carbalde-hyde

Acta Crystallogr Sect E Struct Rep Online. 2013 Aug 14;69(Pt 9):o1416. doi: 10.1107/S1600536813022228. eCollection 2013.

Abstract

The asymmetric unit of the title compound, C10H4Cl2O3, contain two essentially planar independent mol-ecules (mean atomic deviations from the corresponding least-square planes are 0.041 and 0.045 Å for mol-ecules 1 and 2, respectively). In the crystal, mol-ecules are linked through a pair of halogen bonds [Cl⋯O separations are 3.044 (5) and 3.033 (6) Å, C-Cl⋯O angles are 160.4 (3) and 162.8 (3)°, and C=O⋯Cl angles are 138.7 (4) and 139.6 (4)°, respectively, in mol-ecules 1 and 2] and C-H⋯O hydrogen bonds into slightly folded bands [the dihedral angle between the planes of neighboring mol-ecules is 8.6 (2)°] along the c-axis direction.