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Acta Cryst. (2014). E70, o523
[ doi:10.1107/S1600536814007314 ]

Diethyl 4-oxo-4H-[1,4'-bi­quinoline]-3,3'-di­carboxyl­ate

Y. Ishikawa and N. Yoshida

Abstract: In the title mol­ecule, C24H20N2O5, the quinoline and quinolinone moieties are practically perpendicular to each other, forming a dihedral angle of 89.06 (3)°. In the crystal, each moiety forms coplanar [pi]-stacked couples with the respective inversion equivalents. The quinolinone moieties overlap with their benzene rings with a centroid-centroid separation of 3.641 (2) Å, whereas the quinoline moieties overlap with their pyridine rings with a separation of 3.592 (2) Å. The resulting supra­molecular chains propargate along [101].

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