A dimeric pervanadyl (VO2+) complex with a tridentate Schiff base ligand

A di(mu -oxo)-bridged dinuclear complex, [VO(2)(pamh)](2) was isolated by reacting bis(acetylacetonato)vanadium(IV) and the Schiff base, N-(anisoyl)-N'-(picolinylidene)-hydrazine (Hpamh) in acetonitrile. The complex crystallizes in the space group P (1) over bar (#2) on crystallographic inversion center. Crystal data: a = 8.2202(12) Angstrom, b = 9.8389(19) Angstrom ,c = 10.1907(17) Angstrom, alpha = 68.245(15)degrees, beta = 74.47(2)degrees, gamma = 66.710(19)degrees, V = 696.0(2) Angstrom (3), and Z = 1. The physical properties of the complex and the structural parameters are consistent with the +5 oxidation state of the metal ions. The monomeric VO(2)(pamh) unit is square-pyramidal. The planar mononegative ligand (pamh(-)) coordinates the metal ion via the pyridine-N, the imine-N, and the amide-O atoms. One of the oxo groups completes the NNOO basal plane and also participates in the V-O-V bridge formation. The other oxo group satisfies the fifth apical coordination site. The molecular structure of the dimeric complex, [VO(2)(pamh)](2) can be described as two edge-shared distorted VO(4)N(2) octahedra.