Oxovanadium‐Phosphazene Complexes: Synthesis and Characterization

Abstract

Cyclic vanadium‐phosphazene complexes in 5‐ and 6‐coordination have been synthesized by the reaction of bis(acetylacetonato)oxovanadium(IV), [VO(acac)₂], or trichlorooxovanadium(V), [VOCl₃], with acyclic phosphazene ligands, [HN(PPh₂NR)₂], (where R = Ph or SiMe₃) in 1:1 and 1:2 molar ratio. These green colored complexes correspond to the general formulae [VO(acac)L], [VOCl₂L] and [VOClL₂] (where L = [HN(PPh₂NR)₂]. They are fairly soluble in most organic solvents and sensitive to moisture. These complexes are characterized by various physico‐chemical technique, viz elemental analyses (C, H, N, V and Cl), molecular weight determinations and spectral studies including IR and NMR (¹H, ¹³C and ³¹P), which indicated the monomeric nature of the complexes having a bidentate mode of bonding with the phosphazene ligand endowing a square‐pyramidal or octahedral geometry around the vanadium atom, respectively.

Keywords:

• Metallatriazadiphosphorines
• Oxovanadium phosphazenes
• Trichlorooxovanadium
• bis(Acetylacetonato)
• Oxovanadium(IV)

Acknowledgments

Financial support from Department of Science and Technology, New Delhi, is gratefully acknowledged. The authors are thankful to the Regional Research Laboratory, Jammu and Central Drug Research Institute, Lucknow for spectral studies. One of the authors (Y P) is thankful to the Department of Science and Technology, New Delhi, for a junior research fellowship.