Crystal structure and Hirshfeld surface analysis of 3-ethoxy-1-ethyl-6-nitroquinoxalin-2(1H)-one

Abstract

The asymmetric unit of the title compound, C12H13N3O4, consists of two molecules differing to a small degree in their conformations. In the crystal, layers of molecules are connected by weak C—H...O hydrogen bonds and slipped π-stacking interactions. These layers lie parallel to (10\overline{1}) and are stacked along the normal to that plane. Hirshfeld surface analysis indicates that the most important contributions for the crystal packing arise from H...H (43.5%) and H...O/O...H (30.8%) contacts. The density functional theory (DFT) optimized structure of the title compound at the B3LYP/ 6–311 G(d,p) level agrees well with the experimentally determined molecular structure in the solid state.