High-pressure Raman study of K and T forms of the octachloro cyclic phosphazene tetramer P4 N4 CI8

The octachloro cyclic phosphazene tetramer P4N4Cl8 was studied by high‐pressure Raman spectroscopy up to 10 GPa in the K form (boat‐shaped molecule) and in the T form (chair‐shaped molecule). There are pressure‐induced phase transitions in the crystal with the K‐form molecules. There is a conformation change from the T to the K form under a non‐hydrostatic pressure of less than 0.7 GPa.