Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 3 (March 2013)


organic compounds



yk2078 scheme

Acta Cryst. (2013). E69, o376    [ doi:10.1107/S1600536813003206 ]

6,7-Difluoro-1,2,3,4-tetrahydroquinoxaline-5,8-dicarbonitrile

B.-H. Qu, X.-C. Jia, J. Li and M.-Y. He

Abstract: In the title compound, C10H6F2N4, the Car-N bonds are slightly shortened with respect to a standard aniline C-N bond [1.3580 (16) and 1.3618 (16) versus 1.39 Å], thus indicating some [pi]-[pi] conjgation with the electron-acceptor CN groups. The molecule, except for two C atom of the ethylene bridge, is nearly planar, the largest deviation of the other non-H atoms from the mean plane being 0.309 (2) Å. The N-C-C-N torsion angle involving the ethylene bridge is 50.23 (18)°. In the crystal, molecules are connected by pairs of N-H...N hydrogen bonds into chains along [21-1].


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