Synthesis and thermal characterization of zinc(II) di(o-aminobenzoate) complexes of imidazole and its methyl derivatives

Mixed complexes of the type: Zn(Han)2(Him)3, Zn(Han)2(Him)5, Zn(Han)2(4-MeHim)2 and Zn(Han)2(1,2-diMeim)2 (where Han: NH2C6H4COO−, Him: imidazole, 4-MeHim: 4-methylimidazole, 1,2-diMeim-1,2-dimethylimidazole) have been synthesized. The complexes and the corresponding sinters, obtained at temperatures determined on the basis of the thermogravimetric (TG) curves, have been analyzed by chemical, X-ray, infrared (IR) spectroscopy and thermal methods. The compounds with Him and 4-MeHim decompose in two stages, and those with 1,2-diMeim in three stages. Thermal decomposition pathways have been postulated for these complexes.