4′,4′,6′,6′-Tetrachloro-2-(6-methylpyridin-2-yl) -1H,2H-spiro[naphtho[1,2-e][1,3,2]oxazaphosphinine-3,2′-[1,3,5,2,4,6] triazatriphosphinine]

The title compound, C₁₇H₁₄Cl₄N ₅OP3, is a spiro-phosphazene derivative with bulky naphthalene and pyridine rings. The phosphazene and the six-membered N/O rings are in flattened-boat and twisted-boat conformations, respectively. The naphthalene ring system and the pyridine ring are oriented at a dihedral angle of 18.06 (8)°. In the crystal, weak π-π stacking between the pyridine rings and between the pyridine rings and the naphthalene ring system [centroid-centroid distances = 3.594 (2) and 3.961 (2) Å, respectively] occur. Weak C - H⋯π interactions are also observed. These interactions link the molecules into a three-dimensional supramolecular network.