Synthesis and characterization of cyclophosphazene complexes of zirconium(IV)

Abstract

Cyclophosphazene complexes of zirconium(IV) of the types and (R = −Ph or –SiMe3, n = 1 or 2) have been synthesizedand isolated by reactions of acyclic bis-silylated phosphazene, [HN(PPh2NSiMe3)2], or bis-phenylated phosphazene, [HN(PPh2NPh)2], with ZrCl4 or ZrCl2(OPri)2 in different stoichiometries under anhydrous and inert conditions. These cyclozirconatriazadiphosphorines have been characterized by elemental analyses (C, H, N, Cl and Zr), molecular weight determination, IR and NMR (1H, 13C and 31P) spectral studies, which indicated the monomeric nature of these complexes and a bidentate mode of bonding by the phosphazene ligand, leading to trigonal bipyramidal or octahedral geometries around the zirconium.