Strong phenyl–perfluorophenyl π–π stacking and C–H⋯F–C hydrogen bonding interactions in the crystals of the corresponding aromatic aldimines

The X-ray diffraction analysis of two co-crystals, 1·2 (aldimines 1 and 2) and 3·4 (aldimines 3 and 4), reveals that there are strong phenyl–perfluorophenyl π–π stacking and intermolecular hydrogen bonding interactions. The new perfluoroaryl–aryl face-to-face interaction of the crystalline aldimines provides a design motif for a new class of self-assembling system.