phosphazenes

Compounds containing a phosphorus–nitrogen double bond, i.e. derivatives of H3P=NH and HP=NH . A multiplicity of such bonds is present in various well-established chain, ring and cage compounds. E.g.
P04551-1
P04551-2
Source:
PAC, 1995, 67, 1307 (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1357