Synthesis, 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

Abstract

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.

Synthesis, Characterization and Electrochemical Studies on the Corrosion Inhibition Properties of Schiff Bases for Mild Steel in 1 M HCl Solution

“…).The EIS parameters derived from EIS plot (Figs. [10][11][12] are presented in Table 8. The value of n which decreased on addition of SBL1 and SBL2, described the extent of roughness or non-homogeneity of the steel surface suggesting that the adsorption of inhibitor molecules on steel surface active sites increased the surface roughness of the steel [30].…”

“…"A chemical compound which when added to liquid or gas slow down the corrosion rate of a material, typically metal or alloys is known as corrosion inhibitor" [7][8][9]. "Corrosion inhibitors, due to their unique properties are the most convenient means of protecting metals from corrosion process compared to other methods [10]. As a result of the known hazardous effect of most synthetic inhibitors such as chromates, silicates and nitrates coupled with environmental pollution, researchers interest are now directed toward the advancement of ecofriendly less toxic corrosion inhibitors" [3,5].…”

Synthesis, Characterization, Biological Properties, ADMET and Drug-likeness Analysis of Mn (II) complexes with Schiff Bases Derived from Sulphathiazole and 4-diethylaminosalicyaldehyde/Salicyaldehyde

“…The produced compounds' conductance values were less than 10 Ohm -1 cm 2 mol -1 , indicating that they were non-electrolytic in nature. This implied that no anions were present outside of the complexes' coordination sphere [18] [30].…”

“…Schiff bases and their metal complexes have been employed by researchers as chelating ligands in coordination chemistry as catalysts [4][5] [6], as corrosion inhibitors [7] [8], as a dye [9]. Biologically, they have been tested as antibacterial [5][10] [11], antifungal [12] [13], antitumor [14], anticancer [15] antioxidant [16][17], antiviral [18] and antiinflammatory [19] among others. Therefore, the rapid development of novel chemotherapeutic Schiff base…”

Innovation of Imine Metal Chelates as Corrosion Inhibitors at Different Media: A Collective Study

“… results of −20 kJ mol −1 or below are quite well believed to be linked with the physical adsorption phenomena, which involve the electrostatic attraction of the charged molecule with the charged metals, while that of the −40 kJ/mol or above connected with the chemisorption process [ 72 ]. Data of for the ligand, Mn (II) chelate and Co (II) chelate are −9.421 KJmol −1 , −10.445 KJmol −1 and −10.379 KJmol −1 , respectively, showing that the inhibitors are adsorbing physically [ 68 , 73 ].…”