Thermal behaviour of mandelic acid, sodium mandelate and its compounds with some bivalent transition metal ions

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• 作者：D.J.C. Gomes ; F.J. Caires ; ^{caires.flavio@yahoo.com.br} ; L.S. Lima ; A.C. Gigante ; M. Ionashiro
• 关键词：Bivalent transition metals ; Mandelate ; Thermal decomposition ; TG&ndash ; FTIR ; Evolved gases
• 刊名：Thermochimica Acta
• 出版年：2012
• 期刊代码：110_00406031
• 类别：ch
• 出版时间：10 April, 2012
• 卷：533
• 期：Complete
• 页码：16-21
• 文件大小：682 K

摘要

Characterization, thermal stability and thermal decomposition of transition metal mandelates, M(C₆H₅CH(OH)CO₂)₂ (M = Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), as well as the thermal behaviour of mandelic acid C₆H₅CH(OH)CO₂H and its sodium salt were investigated employing simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC), TG-DSC coupled to FTIR, infrared spectroscopy (FTIR), elemental analysis and complexometry. All the compounds were obtained in the anhydrous state and the thermal decomposition occurs in two or four consecutive steps. The final residue up to 320 掳C (Mn), 345 掳C (Fe), 400 掳C (Co), 405 掳C (Ni), 355 掳C (Cu) and 575 掳C (Zn) is Mn₃O₄, Fe₂O₃, Co₃O₄, NiO, CuO and ZnO, respectively. The results also provided information concerning the ligand's denticity, thermal behaviour and identification of gaseous products evolved during the thermal decomposition of these compounds.