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 ato m 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-dimethy laniline shows that there is a close relationship between the strength of t he intermolecular interaction on this side and the tetrahedral character of the N atom.