Article Number: DRJCMS0126893913
Vol. 8, Pp. 31-43, 2021
Copyright © 2021
Author(s) retain the copyright of this article
Original Research Article
Corrosion Inhibition; and Antimicrobial Studies of Bivalent Complexes of 1-(((5-ethoxybenzo[d]thiazol-2-yl) Imino) methyl) naphthalene-2-ol Chelator: Design, Synthesis, and Experimental Characterizations
Heteroleptic bivalent complexes, [M(L)(Y)(Z) (nH2O)] (M=Mn2+, Ni2+, Cu2+and Zn2+); L=1-(((5-ethoxybenzo[d]thiazol-2-yl)imino) methyl)naphthalene-2-ol (HL), Y=2,2’-bipyridine, Z= OAc, n=0,I,2) have been synthesized through reflux-condensation of 2-hydroxy-I-naphtaldehyde, 2-amino-6-ethoxybenzothiazole and 2,2’-bipyridine. The bivalent complexes were acquired on reflux of the -C=N-chelator with acetate salts of, Mn Ni, Cu, and Zn in ethanol (CH3CH2OH). Varied shades of colour distinct from the precursor reagents were noticed for the compounds. The HL plus its complexes were characterized via analytical (melting point, magnetic susceptibility (µeff), molar conductance, plus solubility test) methods; spectral (Fourier Transformation Infrared (FTIR), electronic (UV-vis) assessments; corrosion inhibition plus antimicrobial evaluations. The FT-IR spectrum of HL presented a band at 1622cm-1 which moved to 1616-1622 cm-1 in the spectra of the complexes and was apportioned to an azomethine moiety. The complexes were spin-free as well as non-ionic in nature except the Zn2+ complex. The compounds were found to be inactive against Proteus mirabilis but exhibited one form of action or the other against all other screened microbes. However, outstanding antifungal actions were acquired for the compounds against Aspergillus flavus, fuserium sp. and Aspergillus Niger. The -C=N-chelator plus its bivalent complexes also presented substantial corrosion inhibition behavior in opposition to corrosion of mild steel in aggressive HCl solution. The complexes had extra inhibition efficiency (IE) than the ligand.
Keywords: 2-amino-6-ethoxybenzothiozole, characterization, antimicrobial actions, corrosion inhibition, naphthaladehyde