稀土苯甲酸盐的合成及热分解反应机制

由水热法合成了稀土苯甲酸盐配合物Ｌｎ（Ｃ６Ｈ５ＣＯＯ）３（Ｌｎ＝Ｌａ，Ｎｄ，Ｓｍ，Ｅｕ、Ｇｄ、Ｄｙ、Ｅｒ）。用元素分析、ＩＲ、Ｘ射线粉末衍射表征了该系列配合物。它们都为层状结构，属单斜晶系。用ＴＧ、ＤＴＡ、ＩＲ、色谱－质谱联用仪研究了它们的热分解机制。在氮气氛下，热分解分两步进行：先分解生成二碳酸一氧盐和有机化合物；而后二碳酸一盐进一步分解生成稀土氧化物和二氧化碳。第二步中生成的有机化合物成分比较

Synthesis and Thermal Decomposition Mechanism of RE Benzoates

The RE metal benzoates were synthesized by hydrothermal reaction. The complexes were characterized by elemental analysis, IR and X ray powder diffraction. They can be represented by general formula Ln(C 6H 5COO) 3(Ln=La, Nd, Sm, Eu, Gd, Dy and Er). All of them are monoclinic with layered structure. The mechanism of thermal decomposition of RE metal benzoates was studied by using TG, DTA, IR, and gas chromatography mass spectrometry. The thermal decomposition of the RE benzoates in nitrogen proceeds in two stages: firstly it decomposes to form RE 2O(CO 3) 2 and organic compounds, then RE 2O(CO 3) 2 decomposes further to form RE metal oxides and carbon dioxide. The organic compounds obtained from the first step of the reaction are mainly benzophenone, 9,10 anthraquinone, 1,3 Diphenylisobenzofuran and so on.