Overlaid structures of 1·PhNO2 and 1·DIPA, both viewed down the crystallographic b axis. The 2,4,6-tris(4-pyridyl)-1,3,5-triazene carbon atoms are shown in red for 1·PhNO2 and in blue for 1·DIPA. The DIPA guest is shown with gray carbon atoms. ZnI2 and PhNO2 moieties have been omitted for clarity. The crystallographic a axis is oriented vertically and the c axis horizontally.