A series of transition metal complexes comprising Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) have been synthesized utilizing the Schiff base ligand (L) derived from 1,3-diaminopropane and 2-hydroxy-1-naphtaldhyde.The synthesized metal complexes were characterized using elemental analyses, spectroscopic techniques (1HNMR, UV-visible, FT-IR), magnetic measurements, molar conductivity tests, and thermal anal. studies (TG and DTG).The complexes were formed at a stoichiometric ratio of 1:1 between the metal and L, as determined by the elemental anal. data.The IR spectra confirmed that the ligand displayed bidentate characteristics.The determination of the octahedral geometry of the complexes was based on magnetic moment measurements and electronic spectra.An anal. was conducted on the thermal properties of these chelates, which showed that the complexes with water mols. undergo a process of water removal in the beginning, followed by the breakdown of the anions and ligand mols.The complexes of Fe(III), Mn(II), Ni(II), and Cu(II) displayed a nanostructure, as confirmed by studies made using the scanning electron microscope (SEM) and at. force microscope (AFM).In addition, AFM examination verified that the Fe(III), Mn(II), Ni(II), and Cu(II) complexes had a uniform surface structure consisting of almost spherical grains.The BET anal. and contact angle measurement confirmed the significant surface area, mesoporous structure, and hydrophobic properties of the generated complexes.The biol. activity data showed that the metal complexes displayed higher antibacterial activity compared to the original Schiff base ligand against one or more species.Mol. docking was used to predict the binding efficiency between a Schiff base ligand (L) and metal complexes with the receptors of crystal structures associated with cell cancer (7DAE), COVID-19 (6W41), Candida albicans (5JPE), Neisseria gonorrhoeae (5WAM and 5WAQ), E. coli (1NEK and 4N74), Pseudomonas aeruginosa (3ix3), Bacillus subtilis (3AHU), Staphylococcus aureus (1GHP, 1JIJ, and 1JIL), and Staphylococcus mutans (2ZIC and 3AIC).The nanocomplexes of Fe(III), Cu(II), Mn(II), and Ni(II) were used as adsorbents to remove b∼engal rose dye, resulting in a high removal percentage.