(pi)-Stacking interactions in some crystalline cisoid E,E-1,4-diaryl-1,3-butadienes

A cisoid E,E-1,4-diperfluorophenyl-1,3-butadiene has been prepared in which offset stacking between perfluorophenyl–perfluorophenyl rings occurs, and face-to-face stacking between phenyl–perfluorophenyl rings is found in crystals of its 1 : 1 complex with a cisoid E,E-1,4-diphenyl-1,3-butadiene.