M. T. Ahmet, J. Silver, A. Houlton
Nov 15, 1994
Citations
0
Influential Citations
5
Citations
Journal
Acta Crystallographica Section C-crystal Structure Communications
Abstract
p-Bromo-N-(p-dimethylaminobenzylidene)aniline, C15H15BrN2, (1), comprises two independent molecules with markedly different conformations. Molecule A is essentially planar along its entire length (including the dimethylamino group) whereas molecule B deviates considerably from planarity with an interplanar angle of 145.8 (3) ° between the two phenyl rings and the NMe2 group twisted by 10 (2) ° out of the plane of the phenyl ring to which it is bound. While polymorphism and crystal packing effects are well documented for benzylidene derivatives, this is an interesting example with two quite distinct conformations in the same crystal phase. The differences are accounted for in terms of crystalpacking effects. The structure highlights the ability of particular molecular arrangements to stabilize a less favourable molecular conformation.