Open AccessSynthesis, Characterization and corrosion Inhibition Studies on Mn (II) and Co (II) Complexes Derived from 1-{(Z)-[(2-hydroxyphenyl) imino]methyl}naphthalen-2-ol in 1M HCl Solution
Author(s) -
Aishatu Haruna,
M.M. Rumah,
Umar Sani,
A.K. Ibrahim
Publication year - 2021
Publication title -
international journal of biological, physical and chemical studies
Language(s) - English
Resource type - Journals
ISSN - 2709-1554
DOI - 10.32996/ijbpcs.2021.3.1.2
Subject(s) - chemistry , adsorption , deprotonation , schiff base , inorganic chemistry , metal ions in aqueous solution , metal , molar conductivity , copper , magnetic moment , langmuir adsorption model , ion , crystallography , organic chemistry , physics , condensed matter physics
Schiff base derived from the reaction of 2-amino phenol and 2-hydroxy-1-naphthaldehyde and its Co (II), and Mn (II) complexes have been synthesized and characterized by solubility test, melting point/ decomposition temperatures, molar conductance, IR and magnetic susceptibility. The number of ligands coordinated to the metal ion was determined using Job’s method of continuous variation. Their molar conductance values indicate that all the complexes are non-electrolytes. Magnetic moment values of the complexes showed that both Mn (II) and Co (II) are paramagnetic. The spectroscopic data of metal complexes indicated that the metal ions are complexed with azomethine nitrogen and deprotonated oxygen atom. Corrosion inhibition of the schiff base and Mn (II) and Co (II) complexes were evaluated using the weight loss method in a 0.1MHCl solution for copper metal. The inhibition efficiency increased with increasing inhibitors concentration. The negative values of Gibb’s free energy of adsorption (ΔGads) confirmed the spontaneity and physical adsorption of the inhibition process which is inconsistent with Langmuir adsorption isotherm.