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A new polymeric Schiff base containing formaldehyde and 2-thiobarbituric acid moieties was synthesized by the condensation of a monomeric Schiff base derived from 2-hydroxyacetophenone and hydrazine. Polymer-metal complexes were also synthesized by the reaction of the polymeric Schiff base with Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) acetate. The polymeric Schiff base and its polymer-metal complexes were characterized with magnetic moment measurements, elemental analyses, and spectral techniques (infrared, 1 H-NMR, and ultraviolet-visible). The thermal behaviors of these coordination polymers were studied by thermogravimetric analysis in a nitrogen atmosphere up to 800 C. The thermal data revealed that all of the polymer-metal complexes showed higher thermal stabilities than the polymeric Schiff base and also ascribed that the Cu(II) polymer-metal complex showed better heat resistant properties than the other polymer-metal complexes. The antimicrobial activity was screened with the agar well diffusion method against various selected microorganisms, and all of the polymer-metal complexes showed good antimicrobial activity. Among all of the complexes, the antimicrobial activity of the Cu(II) polymer-metal complex showed the highest zone of inhibition because of its higher stability constant and may be used in biomedical applications.

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