Abstract
The title compound, C10H5FN2, is a monoclinic (P2(1)/c) polymorph of the previously reported triclinic (P (1) over bar) form [Antipin et al. ( 2003). J. Mol. Struct. 650, 1-20]. The 13 non-H atoms in the title polymorph are almost coplanar (r.m.s. deviation = 0.020 angstrom); a small twist between the fluorobenzene and dinitrile groups [C-C-C-C torsion angle = 175.49 (16)degrees] is evident in the triclinic polymorph. In the crystal, C-H center dot center dot center dot N interactions lead to supramolecular layers parallel to ((1) over bar 01); these are connected by C-F center dot center dot center dot pi interactions.