Polynuclear oxovanadium(IV) Schiff base complex [VOL2]n (L = (5-bromo-2-hydroxybenzyl-2-furylmethyl)imine): Synthesis, characterization, crystal structure, catalytic properties and thermal decomposition into V2O5 nano-particles

Polynuclear oxovanadium(IV) Schiff base complex [VOL2]n of bidentate NO Schiff base ligand (L = 5-bromo-2-hydroxybenzyl-2-furyl(methyl)imine) was synthesized and characterized by elemental analysis and FT-IR spectroscopy. The crystal structure of [VOL2]n has been determined by single crystal X-ray diffraction. The complex has two symmetry independent vanadium centers located on a two-fold axis. Both centers have a distorted octahedral N2O4 coordination sphere. Two Schiff base ligands act as chelating ligands and coordinate to the vanadium center each via one nitrogen and one oxygen atom. The remaining two apices of the octahedron are occupied by oxygen shared by the neighboring vanadium atoms, giving rise to 1D coordination polymer [VOL2]n with the interatomic V···V distance 3.7670(6) Å. This complex is used as a catalyst for the epoxidation of the cyclooctene. Different reaction parameters were optimized and the results showed that it can be active and selective in the optimized conditions. After thermal decomposition of the complex, the XRD pattern of the obtained solid shows the formation of the V2O5 nano particles with the average size of 41 nm.

The new polynuclear [VIVOL2]n Schiff base complex, was prepared, characterized by FT-IR spectrum, CHN and single crystal X-ray analysis and used as a homogeneous catalyst in the epoxidation of cyclooctene. The results showed that it was highly active and selective catalyst in optimized conditions in epoxidation of cyclooctene.Figure optionsDownload as PowerPoint slideHighlights
► A new polynuclear oxovanadium(IV) Schiff base complex, [VIVOL2]n was prepared.
► It crystallizes in the monoclinic space group C2/c.
► Its catalytic activity was tested in the epoxidation of the cyclooctene.
► The results showed that it was highly active and selective catalyst.
► Thermal decomposition of [VIVOL2]n resulted in formation of the V2O5 nano-particles.