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THERMAL DECOMPOSITION STUDY OF [MCU(C3H2O4)(2)(H2O)(N)] PHASES (M IS CA (N=3), SR AND BA (N=4))

机译:[MCU(C3H2O4)(2)(H2O)(N)]相的热分解研究(M IS CA(N = 3),SR和BA(N = 4))

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摘要

Three new compounds with the general formula [MCu(C3H2O4)(2)(H2O)(n)] (M is Ca (n = 3), Sr and Ba (n = 4)) have been synthesized and characterized by analytical and infrared techniques. X-ray diffraction methods have shown that all the complexes have orthorhombic unit cells. Thermal decomposition of these compounds using TGA-DSC and DTA techniques involves three consecutive steps: dehydration, ligand pyrolysis and inorganic residue evolution. Dehydration is an endothermic process with enthalpies of around 200 kJ mol(-1). Kinetic analysis of the dehydration curves has been performed and the Johnson equation gave the best correlation factors for the three complexes. Further treatments in tubular furnaces resulted in the formation of mixed oxides of formula MCuO(2) (M is Ca, Sr and Ba). The formation of small homogeneous particles in these oxides, as with metallo-organic percursors, has been observed by scanning electron microscopy. [References: 16]
机译:合成了三种通式为[MCu(C3H2O4)(2)(H2O)(n)]的新化合物(M为Ca(n = 3),Sr和Ba(n = 4)),并通过分析和红外表征技术。 X射线衍射方法表明,所有配合物均具有正交晶胞。使用TGA-DSC和DTA技术对这些化合物进行热分解涉及三个连续步骤:脱水,配体热解和无机残留物析出。脱水是一个吸热过程,焓大约为200 kJ mol(-1)。进行了脱水曲线的动力学分析,Johnson方程给出了三种配合物的最佳相关因子。在管式炉中进行进一步处理导致形成式MCuO(2)的混合氧化物(M为Ca,Sr和Ba)。通过扫描电子显微镜观察到,在这些氧化物中,与金属有机物一样,形成了小的均质颗粒。 [参考:16]

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