In this study, complexes of manganese (II) and zinc(II) with ligands (salicylic acid and cysteine) [MnL₂(H₂O)₂]2H₂O, [ZnL₂(H₂O)₂]2H₂O  have been synthesized. It is shown that the composition of the obtained complexes depends on the ratio of the initial components. The composition and structure of the complexes have been studied by elemental, X-ray phase analysis, (DLS)method, UV-VIS spectroscopy, IR spectral and thermogravimetric analysis. The method of UV spectroscopy has show that the ligands in the composition of the metal (II) complexes enter the neutral form and coordinate with the complexing agent through the nitrogen atom. According to UV spectroscopy has d-d transition was observed in the complexes corresponding to the wavelength for Mn (II) 480-560 nm, for Zn (II) complex 238 nm. The results of thermogravimetric studies have shown that the final product of the thermal decomposition of all compounds is metal oxide, respectively. The complex compounds of manganese and zinc with the amino acids cysteine, methionine, glycine and salicylic acid and nanoparticles of Fe₂ O₃ have a positive effect on seed germination, the synthesis of photosynthetic pigments and activity of ascorbate peroxidase in wheat leaves

doi.org/10.32737/0005-2531-2022-4-53-59