<p>A series of tellurated azo compounds [<i>i.e</i>. (4-HOC<sub>6</sub>H<sub>4</sub>N=N-Ar)TeBr<sub>3</sub> and (4-HOC<sub>6</sub>H<sub>4</sub>N=N-Ar)<sub>2</sub>TeBr<sub>2</sub>, where Ar=5-BrC<sub>6</sub>H<sub>3</sub>, 5-CH<sub>3</sub>C<sub>6</sub>H<sub>3</sub> and 5-NO<sub>2</sub>C<sub>6</sub>H<sub>3</sub>] were prepared by the reaction of the corresponding 2-(4-hydroxyphenylazo)aryl mercury chloride with tellurium tetrabromide in 1:1 and 2:1 mole ratio, respectively in dry dioxane as a solvent. The reduction of (4-HOC<sub>6</sub>H<sub>4</sub>N=N-Ar)TeBr<sub>3</sub> by hydrazine hydrate gave the corresponding ditelluride (<i>i.e</i>., (4-HOC<sub>6</sub>H<sub>4</sub>N=N-Ar)<sub>2</sub>Te<sub>2</sub>). Treatment of (4-HOC<sub>6</sub>H<sub>4</sub>N=N-Ar)<sub>2</sub>TeBr<sub>2</sub> with hydrazine hydrate afforded the corresponding tellurides, (4-HOC<sub>6</sub>H<sub>4</sub>N=N-Ar)<sub>2</sub>Te), in good yields. The structures of all newly synthesized compounds were assigned on the basis of their elemental and spectroscopic data. The antibacterial activity of tellurated azo compounds along with mercurated azo compounds was tested with agar diffusion method against the bacteria strains <i>Staphylococcus aureus</i> and <i>Escherichia coli</i>. The antibacterial activities of tellurated azo compounds were in some cases equal or better than those of the reference drug. The mercurated azo compounds were found to be the more antibacterial activity of than those of tellurated azo compounds.</p
