Vanadium(IV) Schiff base Complex: Synthesis, Characterization, Crystal Structure and Thermal Decomposition into V2O5 Particles

Abstract

Vanadium(IV) complex [VO((MeO-bph)₂en)] (<strong>1</strong>), (MeO-bph)₂en=<em>N,N</em><em>¢</em>-bis(2-hydroxy-4-methoxybenzophenone)-1,2-ethanediamine, was synthesized and characterized by elemental analyses (CHN), FT-IR spectroscopy, thermogravimetry, SEM and single crystal X-ray diffraction. The title complex <strong>1 </strong>was prepared by the reaction of VO(acac)₂, 1,2-ethanediamine and 2-hydroxy-4-methoxybenzophenone (molar ratio 1:1:2). The single-crystal X-ray analysis of <strong>1</strong> shows that the vanadium(IV) ion is located in a distorted square pyramid (N₂O₃) environment with the tetradentate Schiff base ligand coordinated in equatorial positions and one oxygen atom in the axial position. Thermogravimetric analysis shows that the complex <strong>1</strong> decomposes in two stages. Finally, the complex was calcinated at 500 °C for 3 h and the V₂O₅ products characterized by FT-IR and SEM.