Synthesis, characterization, crystal structure and thermal behavior of 4-Bromo-2-(((5-chloro-2-hydroxyphenyl)imino)methyl)phenol and its oxido-vanadium(V) complexes

A new Schiff base ligand (ONO), 4-Bromo-2-(((5-chloro-2-hydroxyphenyl)imino)methyl)phenol and its vanadium(V) complexes [VO(L)(MeO)(MeOH)] 1, [VO(L)(EtO)]22, [VO(L)(2-BuO)] 3, were prepared and characterized by elemental analyses, FT-IR, UV–Vis, 1H NMR and TGA techniques. The structures of the free ligand and all complexes have been determined by X-ray diffraction. The ligand exists in a zwitterionic form while 1 has the metal in a distorted octahedral environment. Both 2 and 3 display distorted square pyramidal coordination for the metal with the former existing as a dimer while the latter is monomeric although showing a weak VO interaction with a neighboring molecule.

► New 2-[[(5-bromo-2-hydroxyphenyl)methylidene]amino]-4-chlorophenol is synthesized.
► The vanadium complexes were prepared and characterized by spectral and TGA techniques.
► The structures of compounds are determined by X-ray studies.
► The complexes show distorted square pyramidal and pentagonal bipyramid geometries.
► The ligand acts a zwitterionic form and complexes have octahedral and square pyramidal environment.