In this work, a new mixed-ligand binuclear Co(II) complex of Schiff base was prepared. Moreover, the characterization of this prepared complex was performed by measurement of melting points, UV-Vis spectra, FT-IR spectra, and magnetic susceptibility measurements, and later compared with metal and ligand solutions. It has been discovered that the Schiff bases with Co(II) ion forms a binuclear complex with a stoichiometry of molar ratio 1:2 from "metal:ligand". The photodecolorization of this complex was done under UV light for ZnO's suspension solution. The results of this photodecolorization showed that the greatest efficiency was obtained with the use of ZnO dose of 300 mg/100 mL and at an initial pH of 7. The decolorization activation energy for this complex is a small value of 11.289 kJ mol -1 . Additionally, the thermodynamic study for this reaction is non-spontaneous, endothermic and less random.

The present study included the synthesis of two series of heterocyclic compounds, azetidin-2-one and 1,3-oxazepine derivatives. All synthesized compounds were characterized using FT-IR and 1H NMR spectra. The study was divided into two parts. The first synthesis Schiff bases derivatives (1-4) via the condensation reaction of 1,1′-biphenyl-4,4′-diamine (A) with benzaldehyde derivatives (2,5-dimethoxybenzaldehyde, 4-hydroxy-3-methoxybenzaldehyde, furan-2-carbaldehyde and 3-hydroxybenzaldehyde). The second synthesis azetidine-2-one derivatives (5-8) from the reaction of Schiff bases with chloroacetyl chloride. Schiff bases also reacted with maleic anhydride to yield 1,3-oxazepine derivatives (9-12).

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In this paper, binuclear metal complexes of the metal ions Fe(II), Co(II), Ni(II) and Cu(II) were synthesized by the reaction of the primary ligand (imine of benzidine) (H2L) and the secondary ligand (1,10-phenanthroline) (L`) with these metal ions in a molar ratio of 1:2:2, respectively. The complexes were characterized using CHN elemental analysis, FT-IR, UV-Vis, magnetic susceptibility, molar conductivity, 1H NMR, and TGA-DTA thermogravimetric analysis. According to the results obtained from the elemental analysis and spectral measurements where complexes of Fe(II), Co(II) and Ni(II) have octahedral geometry, while the complex with Cu(II) has a square planar geometry. All the prepared complexes are wholly stable and can keep for months without any significant change. The antibacterial activities of the prepared compounds were evaluated with regard to two bacteria species, gram-negative Proteus and Kelbsiella, by using diffusion agar plates. The inhibition zone diameter around the holes indicated the sensitivity of the bacteria to these compounds, where the Klebsiella bacteria were revealed to be more highly sensitive to these compounds than Proteus bacteria. All synthesized complexes showed more significant effects against Kelbsiella and Protea than the antibiotic (Amikacin).

Copper oxide nanoparticles have been prepared by the reductions of cupper salts in the solid sodium hydroxid in the presence of salisylic acid as a catalyst and NaOH as asstabilizing. The prepared nano particles were charecterized using. FT–IR spectroscopy, X-ray diffraction pattern, and scanning electron microscope, the synthesized copper oxide nanoparticles, have sizes in the range of (5-31)nm and layer thikness 6-9nm depending on the starting materials ( cupper salts).