Synthesis, Characterization and Thermal Analysis of Cu (II), Co (II), Ru(III) and Rh(III) Complexes of a New Acidic Ligand

Abstract

Hippuric acid and 3-amino phenol were used to make the 4-(2-Amino-4-hydroxy-phenylazo)-benzoylamino-acetic acid diazonium salt, a new Azo molecule that is a derivative of the (4-Amino-benzoylamino)-acetic acid diazonium salt. We found out what the ligand's chemical structures were by using information from 1HNMR, FTIR, CHN, UV-Vis, LC-mass spectroscopy, and thermal analyses. To make metal complexes of the azo ligand with Co(II), Cu(II), Ru(III), and Rh(III) ions, extra amounts of each azo ligand were mixed with metal chloride salts in a 2:2 mole ratio. The stereochemical structures and geometries of the metal complexes that were studied were guessed based on the fact that the ligand exhibited tetradentate bonding behavior when combined with the metalions. The azodye ligand is coordinated with the metal ions (Co(II), Cu(II),Ru(III), and Rh(III)) through (NNOO) the N atoms of azo and amine groups and the oxygen of carboxylic and phenolic hydroxyl groups. According to analytical results, the Ru(III) and Rh(III) complexes have binuclear octahedral geometry, whereas the Cu(II) and Co(II) complexes have binuclear distorted octahedral and binuclear tetrahedral geometry, respectively. The results indicated that the following formulas for ligand complexes should be used: [Ru2Cl2(H2O)2(LI)2], [Rh2Cl2(H2O)2(LI)2], [Co2(LI)2], and [Cu2(LI)2]. The thermal analysis conducted by TG, DTG, and DTA demonstrated partial breakdown at temperatures between 820°C and 850°C.

Keywords

• Azo ligand (acidic), Mass spectroscopy, Metal complexes, TGA