A Study on Thermal Degradation of Hydrazinated Transition Metal Acetamido Benzoates
A research has been performed and published here on the preparation of hydrazinated metal complexes of isomeric acetamide benzoic acids with Co, Ni , Zn and Cd metals and characterization using analytical, FT IR, UV reflectance, micro elemental analysis, simultaneous TG-DTA, powder XRD, measurements of magnetic susceptibility and SEM-EDX studies. H2O, where M = Co, Cd and Zn; [M(3-acamb)2(Hz)].H2O, where M = Ni and Co and [M(3-acamb)2(Hz)].H2O, where M = Ni and Co and [M(3-acamb)2(Hz)].2H2O, where M = Cd and Zn; [Co(4-acamb)2(Hz)].H2O and [M(4-acamb)2(Hz)].2H2O, where M = Ni, Cd and Zn, 2-acambH = 2-acetamide benzoic acid, 3acambH = 3-acetamide benzoic acid, 4-acambh = 4-acetamide benzoic acid, 4-acambh = 4-acetamide benzoic acid, and 4-acetamide benzoic acid Uh. N2H4. Among these, the 2-acambH and 4-acambH Ni , Co and Cd complexes were obtained at pH 5 and 6, respectively, while the Zn complexes of both acids were generated at pH 3. At pH 5, 3-acambH complexes were prepared. The N-N stretching frequency absorptions are shown by the IR spectra of the compounds in the range of 984-926 cm-1, suggesting hydrazine’s bridging bidentate coordination. In the range 1611-1582 cm-1 and in the range 1555-1422 cm-1 the compounds display the values of ¤(C = O)(asym) and the values of Å(C = O)(sym). The difference between (C = O) (asym) and (C = O) (sym), which is found to be 48-162 cm-1, indicates that in the bidendate mode, the carboxylate anion is coordinated with the metal ion. These complexes first remove water molecules in the 140-177oC range and then undergo oxidative decomposition, exhibiting exotherms to their metal oxides in the 200-278oC and 400-682oC range. Complexes of cadmium and zinc reveal their intermediates as carbonates. The electronic spectrum and the susceptibibi magnet
Dr. E. Helen Pricilla Bai
Department of Chemistry, Park College of Engineering and Technology, Kaniyur, Coimbatore-641 659, India.
Dr. S. Vairam
Department of Chemistry, KPR institute of Engineering and Technology, Arasur, Coimbatore – 641407, Tamil Nadu, India.
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