Acta Cryst. (2005). E61, o1456-o1458  [ doi:10.1107/S1600536805011943 ]

4-Chloro-3-nitrocoumarin: an unusual non-bonding C-ClO=C interaction

I. Fujii, Y. Mano and N. Hirayama

Abstract: In the title compound, 4-chloro-3-nitro-2H-chromen-2-one, C₉H₄ClNO₄, the coumarin core has a planar conformation. The Cl atom accepts one of the bifurcated lone pairs of the keto O atom with sp² hybridization state. The other lone pair is donated to the pyran ring of a neighboring molecule.

Online 27 April 2005

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