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This is the first study of the antibacterial activity of heptadentate Schiff base ligand (trensal) and its Cr(III), Co(III), Ni(II), and Mn(III) complexes that have been synthesized from the heptadentate Schiff base ligand derived from salicylaldehyde and tris(2-aminoethyl)amine. Heptadentate Schiff base ligand and its complexes were characterized by elemental analysis, 1 H and 13 C NMR, IR, and UV-Vis spectroscopy. The products were tested in vitro against the bacterial species, Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Bacillus cereus by disc diffusion and micro-broth dilution methods. All compounds demonstrated potent antibacterial activity higher than the Schiff base ligand. Staphylococcus aureus was the most susceptible bacterial species to Co(III) complex while Escherichia coli and Pseudomonas aeruginosa required a relatively higher minimum inhibition concentrations of Cr(III) and Ni(II) complexes. Co(III) complex was the most potent inhibitor against Pseudomonas aeruginosa. Mn(III) complex was active against Pseudomonas aeruginosa.

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Copper(II) α-benzoin oxime complex was synthesized by the reaction between copper(II) benzoate and α-benzoin oxime. The poly methacrylic acid-ethylene glycol dimethacrylate (MAA-EGDMA) was applied as support of copper complex catalyst for oxidation of alcohols to aldehydes using NaClO. The structure and morphology of immobilized Cu(II)-benzoin oxime have been studied by using different analysis including Fourier Transform Infrared (FT-IR) spectroscopy, Scanning Electron Microscopy (SEM) and Thermal Gravimetric Analysis (TGA). The yield of aldehydes was determined by Gas Chromatography (GC) analysis. The immobilized Cu(II)-benzoin oxime indicated a high catalytic activity compared to its absence for the alcohol oxidation with sodium hypochlorite. The effect of the reaction time and temperature, the solvent type, the amounts of catalyst and NaClO were optimized to obtain maximum yield. The prepared catalyst had various benefits such as being inexpensive, environmentally friendly manner, recyclable, reducing the reaction time and increasing the yield. A reaction mechanism is proposed for oxidation of alcohols in the presence of the catalyst.