Intermolecular interactions and ­molecular geometry in molecular complexes of N,N‐di­methyl­aniline: the 1:1 complex with 1,2,4,5‐tetra­cyano­benzene

The partner mol­ecules of N,N‐di­methyl­aniline–1,2,4,5‐tetra­cyano­benzene (1/1), C₈H₁₁N·C₁₀H₂N₄, are stacked alternately in infinite columns. The N atom of the N,N‐di­methyl­aniline mol­ecule has a partially tetrahedral character and the distance between neighbouring mol­ecules in the stack is relatively short on the side where the lone‐pair electrons of this atom are located. Molecular‐packing analysis of this and three other complexes of N,N‐di­methyl­aniline shows that there is a close relationship between the strength of the intermolecular interaction on this side and the tetrahedral character of the N atom.