Cyclotriphosphazene hydrazides as efficient multisite coordination ligands.: η3-fac-non-geminal-N3 coordination of spiro-N3P3[O2C12H8][N(Me)NH2]4 (L) in L2CoCl3 and L2M(NO3)2 (M = Ni, Zn, Cd)

The cyclophosphazene tetrahydrazide spiro-N3P3[O2C12H8][N(Me)NH2](4) (L) functions as a multisite coordination ligand and affords L2CoCl3.2CH(3)OH (4), L2Ni(NO3)(2).2CHCl(3).2.5H(2)O (5), L2Zn(NO3)(2).2CH(3)CN.2H(2)O (6), and L2Cd(NO3)(2) (7). Each of the cyclophosphazene ligands that is involved in coordination to the metal functions as a non-geminal-N-3 donor coordinating through one ring nitrogen atom and two non-germinal-NH2 nitrogen atoms. The coordination geometry around the metal ion in 4-6 is approximately octahedral while it is severely distorted in the case of 7.