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.
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