A Schiff base was prepared via condensation reaction of 4-chlorobenzaldehyde, 2-hydroxybenzaldehyde, and p-phenylenediamine, and its Co(II), Ni(II), and Cu(II) polymeric complexes were obtained in similar manner. ¹H and ¹³CNMR, FT-IR, UV-Vis, CHN, ICP, and conductivity measurements were utilized for structural investigation. The ¹HNMR confirmed the formation of the azomethine by detecting two singlet peaks of the protons that are associated with C=N groups, and the peaks related to the carbons of the azomethine groups were revealed by ¹³CNMR. The FT-IR also disclosed sharp strong bands at 1680 and 1537 cm^-1 in the spectrum of the SB ligand, and in the spectra of the polymeric complexes these bands shifted to higher or lower frequencies, proving the coordination to the ligand. The UV-Vis has clearly shown abroad absorption bands at 255 and 339 nm for the synthesized SB ligand, accredited to the π → π^* transitions of the C=C aromatic rings and n → π^* transitions of C=N azomethine groups. These transitions have also shifted to higher or lower frequencies in the UV-Vis spectrum of the polymeric complexes, affirming their formation. Moreover, it was determined that the polymeric complexes possess an octahedral geometry shapes, which were detected by the d-d transitions in the UV-Vis spectrum. The polymeric Cu(II) and Ni(II) complexes were tested for their antibacterial activities, and had shown a potent effect against Salmonella typhi.