Fig. 3: Single-crystal X-ray diffraction structures of 5 and 8.

a Top and (b) side views of 5, (c) top and (d) side views of 8. Also shown are the dihedral angles between the two unfused phenylenes and their adjacent benzene rings. Thermal ellipsoids are scaled to the 30% probability level. Hydrogen atoms and meso-aryl groups are omitted for clarity.