Substituent group effects on the self-assembly of oxovanadium(V) complexes with hydrazone ligands bearing benzoic acid (1-methyl-3-oxobutylidene)hydrazide backbones

Abstract

An oxo-bridged dinuclear oxovanadium(V) complex, [V₂O₂(μ-O)(L¹)₂] (1) [H₂L¹ = 3-nitrobenzoic acid (1-methyl-3-oxobutylidene)hydrazide], and a mononuclear oxovanadium(V) complex, [VO(OMe)(L²)] (2) [H₂L² = 3-hydroxynaphthalene-2-carboxylic acid (1-methyl-3-oxobutylidene)hydrazide], were prepared by the reactions of [VO(acac)₂] with H₂L¹ and H₂L², respectively, in methanol. Both complexes were characterized by elemental analysis, IR spectra, and single crystal X-ray crystallography. The crystal of 1 crystallizes in the monoclinic space group P2/n, with a = 13.116(3) Å, b = 7.597(2) Å, c = 13.927(2) Å, β = 104.851(2)°, V = 1341.4(5) ų, Z = 2. The crystal of 2 crystallizes in the triclinic space group \(P\overline 1 \), with a = 7.897(2) Å, b = 9.690(2) Å, c = 11.576(3) Å, α = 86.405(2)°, β = 70.597(2)°, γ = 85.991(2)°, V = = 832.7(3) ų, Z = 2. The V atoms in the complexes have square pyramidal environment. The substituent groups attached to the aromatic rings can influence the self-assembly of the complexes.