2,8,9-Tris(2-methyl­prop­yl)-2,5,8,9-tetra­aza-1λ⁵-phosphatricyclo­[3.3.3.0^1,5]undecan-5-ium chloride dihydrate

The asymmetric unit of the title hydrated salt, C₁₈H₄₀N₄P⁺·Cl⁻·2H₂O, consists of two ionic mol­ecules and four water mol­ecules. The mol­ecular geometry around the penta­coordinate P atom is trigonal–bipyramidal, with a H atom and an apical N atom in axial positions and three N atoms with isobutyl substituents in equatorial positions. The Cl⁻ ions and water mol­ecules are connected via O—H...Cl hydrogen bonds, forming chains along [100]. The ethyl­ene bridging groups are disordered with refined site-occupancy ratios of 0.578 (9):0.422 (9).