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The characterization of a new, synthesized Mn(II) Schiff base complex of the [MnL2Cl]Cl type (where L = 2-((pyridine-4-yl)metheleneamino)-3-aminomaleonitrile) was carried out by FT-IR, UV–Vis, DRS, GC–Mass, photoluminescence spectroscopy (PL) and elemental analysis. The production of Mn3O4 nanoparticles using thermal decomposition and its spectral properties in the current study is being checked. The nano compounds were characterized by X-ray diffraction, scanning electron microscopy (SEM), and the X-ray energy-dispersive spectrometry analyses. Synthesized manganese oxide nanoparticles have a tetragonal structure with the average size of 25–150 nm. The results of SEM showed that the morphology of [MnL2Cl]Cl was rod-like while the morphology of the Mn3O4 was rod-like as well as spherical. Also, the metal complexes’ antibacterial and antifungal activities were evaluated. The results of the microbiology activities indicated that the metal compounds exhibited stronger microbiology efficiencies than the ligand did.

A novel Fe(III) Schiff base complex of the [FeL2(NO3)2]NO3 type where L = 2-((pyridin-4-yl)methyleneamino)-3-aminomaleonitrile was synthesized using the reflux and sonochemical methods and their antibacterial and antifungal activity were evaluated. The nanoparticles of iron oxide (Fe2O3) were obtained from the iron nano-structure complex as a precursor after calcination at 600 ˚C for 3 h. All the synthesized compounds were characterized by various spectroscopic techniques. The results of SEM showed that the morphology of iron nano-structure complex was rod-like while the morphology of the Fe2O3 nano powder was spherical. The results of the biological studies indicated that the iron nano-structure complex showed a stronger antibacterial and antifungal efficiency than its bulk complex. Finally, the empirical geometrical parameters of complexes revealed a good agreement with calculated ones at DFT-B3LYP level.