3-(3-Nitro­benz­yl)-4H-chromen-4-one

In the title compound, C₁₆H₁₁NO₄, the dihedral angle between the 10-membered coplanar chromone ring system and the benzene ring is 77.83 (3)°. In the crystal, weak C—H...O hydrogen bonds link the mol­ecules into a three-dimensional network.

3-(4-Nitro­benz­yl)-4H-chromen-4-one

In the title compound, C₁₆H₁₁NO₄, the dihedral angle between the ten-membered chromen-4-one ring system (r.m.s. deviation = 0.0095 Å) and the benzene ring is 86.16 (5)°. In the crystal, mol­ecules are linked into a three-dimensional network by weak C—H...O hydrogen bonds. The crystal studied was a non-merohedral twin, with the minor twin component refining to 0.093 (1).