Preparation and Characterization of 2-Hydroxybenzohydroxamic acid and its Complexes with Zinc (II), Copper (II) and Nikcl (II)

The complex formation between Zinc (II), Copper (II) and Nikcl(II) metal cations with 2-Hydroxybenzohydroxamic acid were studied. Firstly, 2-Hydroxybenzohydroxamic acid had been prepared by the reaction of methyl salicylate and free hydroxylamine and was characterized by its melting point, (170 ºC), FT-IR showed characteristics spectral bands at 3200cm -1 due to (OH) stretching vibration,1613 cm -1 due to (C=O) and 907 cm -1 due to (N-O). The 1 H NMR spectrum shows the characteristic attachment of the proton of the hydroxyl group to the nitrogen atom in the region 11.40 -12.21 ppm, the appearance of protons of aromatic ring in the region 6.92 -7.86ppm. Zinc (II), Copper (II) and Nikcl (II) 2-Hydroxybenzohydroxamate acid complexes were 2prepared by reacting 2-Hydroxybenzohydroxamic acid with corresponding metal salts. The compounds were characterized using elemental analysis, spectral (infrared, UV-Vis), TGA and magnetic susceptibility. The purity of the complexes was confirmed by CHN analysis. The result indicate that the reaction between Zinc (II), Copper (II) and Nikcl(II) with (2-Hydroxybenzohydroxamic acid) at 1:1 molar ratio but with zinc(II) was 1:2 molar ratio. They show absorbance at a wavelength of maximum (λmax) 340nm, 780 nm and 430 nm for Zn +2 Cu +2 and Ni 2 respectively indicating that the metal ligand complexes were formed. The complexes were characterized by FT-IR characteristics spectral which showed bands at1572-1599 cm -1 (C=O) and 917-947 cm -1 (N-O), TGA thermogram of all complexes has shown three characteristics mass loss and residue mass as metal oxide. The spectral study analysis reveals that all complexes coordinated to the metal via oxygen atoms (O, O) in bidentate to form octahedral for [Zn(L)2. Cl2]2H2O, square planer for [Cu(L). Cl.H2O]H2O and tetrahedral for [Ni(L).Cl2] H2O.