Iron-Containing Metallophosphazenes and Their Clusters Derived from Chlorophosphazenes and Organometallic Dianions by Harry R. Allcock and others (1984, 10.1021/ja00329a057)

Journal of the American Chemical Society 106, 4966–4977. Diiron spiro structures and triiron products show phosphorus–metal and nitrogen–metal bonding; triiron compound 3 is also obtained from diiron compound 2 and neutral iron carbonyls.