SYNTHESIS, AND SPECTRAL AND X-RAY STRUCTURAL STUDIES OF A NOVEL DELOCALIZED DIPHOSPHAZENE (CF3)2P=N=PPH3 AND THE IRON CARBONYL-COMPLEXES [FE(CO)4((CF3)2P=N=PPH3)] AND [FE(CO)3((CF3)2P=N=PPH3)2]

The diphosphazene (CF3)2P = N = PPh3 L prepared from the reaction of (CF3)2PN3 with PPh3 has been shown from a single-crystal X-ray structural study to possess an unusual and novel delocalised P = N = P moiety containing P(IV) and P(V) atoms; the P = N = P structure is retained upon coordination to Fe in the complexes [Fe(CO)4{(CF3)2P = N = PPh3}] 1 and [Fe(CO)3{(CF3)2P = N = PPh3}2] 2.