Synthesis, Structure and Characterization of New Amic Acid Derivatives of 3-Amino-1,2,4-Triazole and Their Complexes with Some Metal Ions

Three new amic acid ligands namely: 2-(1H-1,2,4-triazol-3-ylcarbamoyl) benzoic acid(HLI), 2-(1H-1,2,4-triazole-3-ylcarbamoyl)-3,4,5,6-tetrachlorobenzoic acid (HLII) and 3-(1H-1,2,4-triazol-3-ylcarbamoyl) propanoic acid (HLIII) were synthesized by condensation reaction of 3-amino-1,2,4-triazole (3-AT) with phthalic anhydride, 2,3,4,5-tetrachlorophthalic anhydride and succinic anhydride respectively in refluxing dry methanol, dimethylformamide (DMF) or ethanol respectively. Metal complexes were synthesized by heating each ligand with Co(II), Ni(II), Cu(II), and Zn(II) acetates in dry ethanol or dimethylacetamide(DMA). Structures of the studied compounds were characterized by CHN and thermogravimetric analyses, 1H nmr, ir, and mass spectrometric analyses as well as metal percentage, electronic spectra, magnetic moments and electrical conductivity measurements for the metal complexes. Band energies and ligand field transitions obtained from the electronic spectra, together with magnetic moment values of metal complexes showed that coordination of all metal ions with ligand donor atoms acquired octahedral geometry. The ligands and some selected metal complexes were tested for antibacterial activity.