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A new Schiff base ligand(HL) was synthesized by condensation of 4-amino-5-(4-nitrophenyl)-4H-1,2,4-triazole-3-thiol with 4-phenoxybenzaldehyde. A new three metal complexes Zn (II), Cd (II) and Hg (II) with Schiff ligand (HL) ware synthesized by molar ratio of ligand : metal as 2:1. The ligand and metal complexes were characterization by H 1 -NMR, FT-IR, Atomic absorption, CHNS analysis, molar conductivity magnetic susceptibility and melting point. There are study thermal analysis TGA-DTG for the ligand and metal complexes. All complexes were found to be non-electrolyte. The biological activity (antibacterial) in-vitro are investigated for the complexes at prepared concentration (1*10-3 M) and showed inhibition ability against growth of the four types of pathogenic bacteria: [ Staphylococcus aurous . and  Streptococcus sp .] as gram positive and [ Escherichia coli and Pseudomonas aeruginosa ] as gram negative. The most of these complexes are effective against both types of bacteria in varying degree, with high activity for Hg (II) complexes.

journal of physics. conference series

Synthesis, characterization of new 5-(4-nitrophenyl)-4-((4 phenoxybenzylidene)amino)-4H-1,2,4-triazole-3-thiol metal complexes and study of the antibacterial activity