2-(1,2,3,4-Tetra-hydro-phenanthren-1-yl-idene)malononitrile.

In the title complex, C(17)H(12)N(2), the non-aromatic six-membered ring adopts an envelope conformation. The dihedral angle between the eight-membered plane containing the malononitrile group and the aromatic system is 25.88 (4)°.