Structural investigations into a new polymorph of F(4)TCNQ: towards enhanced semiconductor properties

During the course of research into the structure of 2,3,5,6-tetra­fluoro-7,7,8,8-tetra­cyano­quinodi­methane (F(4)TCNQ), C(12)F(4)N(4), an important com­pound in charge-transfer and organic semiconductor research, a previously unreported polymorph of F(4)TCNQ was grown concomitantly with the known polymorph from a saturated solution of di­chloro­methane. The structure was elucidated using single-crystal X-ray diffraction and it was found that the new polymorph packs with mol­ecules in parallel layers, in a similar manner to the layered structure of F(2)TCNQ. The structure was analysed using Hirshfeld surface analysis, fingerprint plots and pairwise inter­action energies, and com­pared to existing data. The structure of a toluene solvate of F(4)TCNQ is also reported.