Preparation, and analyses of cinnamon hydroxamic acid and its complexes with iron (III) and vanadium (V)
Rehab AI, Elmugdad AA, A Azize ME
Cinnamon hydroxamic acid had been prepared by coupling reaction of methyl cinnamate and free hydroxylamine and was characterized by melting point. (145 ºC), iron and vanadium color test, FT-IR characteristics spectral bands at 3260cm-1 (OH),1663 cm-1 (C=O) and 900 cm-1 (N-O). The 1H NMR spectrum shows the characteristic attachment of the proton of the hydroxyl group to the nitrogen atom in the region 9.045 – 9.229 ppm, the shift of the resonance signal of hydroxyl proton to lower field to support intermolecular hydrogen bonding, the appearance of protons of aromatic ring in the region 7.071 – 8.32 ppm, and the appearance of protons of – CH3 group in the region 2.322 – 2.346 ppm. The 13C NMR spectra exhibit absorption signal due to carbonyl (C=O) nearly 165 ppm. The chemical shifts of aromatic carbons appear in the region 123.43 – 149.21 ppm. Beside these signals, a singlet signal nearly 21 ppm appeared which corresponding to carbon atom of alkyl group. Iron (III) and vanadium (V) cinnamon hydroxamate complexes were prepared by reacting cinnamon hydroxamic acids with corresponding metal salts at pH 3 media. Showing the characteristic colors. They show absorbance at a wavelength of maximum (λmax) 480nm, 520 nm for Fe3+,V5+ complexes respectively indicating that the metal ligand complexes were formed from both. The complexes were characterized by FT-IR characteristics spectral bands at cm-1 (OH),1663 cm-1 (C=O) and 900 cm-1 (N-O), the 1H NMR spectrum of Fe (III) cinnamon hydroxamate complexes showed the characteristic at7.2-7.3 the appearance of protons of – CH3 group, and 1H NMR spectra of V (V) - cinnamon hydroxamate complexes in under investigation showed the characteristic at 6,7.5-8. 4 due to the protons of aromatic ring appear in the region. The13C NMR spectra exhibit absorption the chemical shifts of aromatic carbons appear in the region 122.7 – 139.21 ppm.
Rehab AI, Elmugdad AA, A Azize ME. Preparation, and analyses of cinnamon hydroxamic acid and its complexes with iron (III) and vanadium (V). International Journal of Multidisciplinary Research and Development, Volume 5, Issue 11, 2018, Pages 16-21