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Synthesis, characterization and biological activity of salen-mixed ligand complexes with nickel(II), copper(II) and coba

Synthesis, characterization and biological activity of salen-mixed ligand complexes with nickel(II), copper(II) and coba

The mixed Schiff base ligand, N,N′-o-phenylenebis(salicylideneimine) (H2salen) with the ligands 4- aminoantipyrine (AAP) or ammonium pyrrolidinedithiocarbamate (APDC) were reacted with Ni(II), Cu(II) and Co(II) acetates. Four new different complexes were prepared and formulated as [Ni2(salen)(CH3CO2)2(AAP)2] (1), [Ni2(salen)(CH3CO2)2(PDCH)2]·2H2O (2), [Cu2(salen)(CH3CO2)2]·2H2O (3) and [Co(salen)(CH3CO2)]·(H2O) (4). The H2salen ligand and its complexes were characterized by IR, UV-visible, TG, elemental analyses, and molar conductivities. The complexes were proposed to be distorted octahedral geometry with Ni(II) and Co(III) and distorted square planar geometry with Cu(II). Antibacterial activity of the complexes was tested against selected bacteria by agar well diffusion method.

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262 views • 12 slides
4-Aminoantipyrine as corrosion inhibitor for zinc in phosphoric acid

4-Aminoantipyrine as corrosion inhibitor for zinc in phosphoric acid

The corrosion of zinc in phosphoric acid containing 4-aminoantipyrine has been studied at different acid concentrations, inhibitor concentration and temperatures. Corrosion increases with the concentration of acid and the temperature. Inhibition efficiency (I.E.) of 4-aminoantipyrine increases with the concentration of inhibitor and decreases with the increase in concentration of acid. As temperature increases, percentage of inhibition decreases. The plot of log (θ/1-θ) versus log C results in a straight line suggest that the inhibitors cover both the anodic and cathodic regions through general adsorption following Longmuir isotherm. Galvenostatic polarization curves show polarization of both anode as well as cathode.

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87 views • 6 slides

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