Fig. 6. Up: Views of partial packing diagrams of compound 2 viewed along the c axis are displayed; left up: a 2D plane arrangement is built by N–H⋯N hydrogen bond interactions (black dash lines, Table 4) along the ab plane generating the hexagonal unit bolded by capped stick style with the ring cavity in the middle; right up: the 2 × 2 × 2 unit cell packing diagram of 2 showing the 2D planes taken together represent the non-interacting phosphoryl groups occur within the ring cavities; down: a 3D network is formed by connecting the 2D hydrogen bonded planes via (C–H…)3O P hydrogen bond interactions (green dash lines, Table 4).
