JOURNAL OF CHILEAN CHEMICAL SOCIETY

Vol 63 No 4 (2018): Journal of the Chilean Chemical Society
Original Research Papers

Mn2+-COMPLEXES OF N,O-DIHYDRAZONE: STRUCTURAL STUDIES, INDIRECT BAND GAP ENERGY AND CORROSION INHIBITION ON ALUMINUM IN ACIDIC MEDIUM

Ayman H. Ahmed
Chemistry Department, College of Science and Arts, Jouf University Department of Chemistry, Faculty of science, Al-Azhar University
A. M. Hassan
Department of Chemistry, Faculty of science, Al-Azhar University
Hosni A. Gumaa
Department of Chemistry, Faculty of science, Al-Azhar University
Bassem H. Mohamed
Department of Chemistry, Faculty of science, Al-Azhar University
Ahmed M. Eraky
Department of Chemistry, Faculty of science, Al-Azhar University
Published January 9, 2019
Keywords
  • Metal complexes,
  • Hydrazones,
  • Structure elucidation,
  • Corrosion
How to Cite
Ahmed, A. H., Hassan, A. M., Gumaa, H. A., Mohamed, B. H., & Eraky, A. M. (2019). Mn2+-COMPLEXES OF N,O-DIHYDRAZONE: STRUCTURAL STUDIES, INDIRECT BAND GAP ENERGY AND CORROSION INHIBITION ON ALUMINUM IN ACIDIC MEDIUM. Journal of the Chilean Chemical Society, 63(4). Retrieved from https://jcchems.com/index.php/JCCHEMS/article/view/913

Abstract

Mononuclear manganese complexes of dihydrazone derived from the condensation of oxaloyldihydrazide with 2-hydroxynaphthaldehyde and 2-methoxybenzaldehyde have been synthesized. The hydrazone Schiff base ligands and their chelates were characterized on the basis of their elemental analyses, spectral (UV-Vis., IR, mass, 1H/13C NMR), magnetism, ESR and thermal (TGA) measurements. The dihydrazone has been suggested to coordinate to the metal center in bi-dentate manner forming 1:1[M:L] complex. The complexes are suggested to have tetrahedral/octahedral stereochemistry. Optical transmission spectra were recorded in the range 190–2100 nm and optical band gap energy was determined. The band gap energy (Eg) for all separated compounds lies in the range of semiconductors. On the other hand, the inhibition and adsorptive properties of the ligands for the corrosion of aluminum in 1 M HCl solutions were studied using traditional weight loss measurements. The results revealed that bis(2-methoxy-benzaldehyde)oxaloyldihydrazone has a greater inhibition than bis(2-hydroxy-1- naphthaldehyde)oxaloyldihydrazone. The adsorption of the inhibitors on metal surface was found to be spontaneous first order reaction and consistent well with the mechanism of physical adsorption. The adsorption data fitted well to Freundlich, Langmuir and Frumkin adsorption isotherms.

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