| Synthesis and Thermal Decomposition Mechanism of Rare Earth （RE=La, Y, Gd） Salicylates |
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| 引用本文： | 李良超 周享春 郑人卫. Synthesis and Thermal Decomposition Mechanism of Rare Earth （RE=La, Y, Gd） Salicylates[J]. 中国化学, 2004, 22(11): 1279-1282. DOI: 10.1002/cjoc.20040221113 |
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| 作者姓名： | 李良超 周享春 郑人卫 |
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| 作者单位： | [1]Department.ofChemistry,InstituteofPhysicalChemistry,ZhejiangNormalUniversity,Jinhua,Zhejiang,321004,China [2]CollegeofChemistryandEnvironmentalEngineering,YangtzeUniversity,Jingzhou,Hubei434102,China |
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| 基金项目： | Project supported by the Natural Science Foundation of Hubei Education Committee (No. 2003A010) and Introducing Able Person Foundation of Zhejiang Normal University. |
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| 摘 要： | The rare earth (RE=La, Y, Gd) salicylates were synthesized by the rheological phase reaction method. The complexes were characterized by elemental analysis, infrared spectra (IR), X-ray powder diffraction (XRD) and thermal gravity analysis (TG). They can be represented by general formula RE(HSal)3 (RE=La, Y, Gd; HSal=C6Ha(OH)COO). The crystals of them are monoclinic and have layered structure. The mechanism of thermal decomposition of rare earth salicylates was studied by using TG, DTA, IR and gas chromatography-mass spectrometry (GC-MS). The thermal decomposition of the rare earth salicylates in nitrogen gas proceeded in three stages: firstly, they were decomposed to form RE2(Sal)3 (Sal=C6H4OCOO) and salicylic acid; then, RE2(Sal)3 were decomposed further to form RE2O(CO3)2 and some organic compounds; finally, RE2O(CO3)2 were decomposed to form rare earth metal oxides (RE2O3) and carbon dioxide. The organic compounds obtained from the second step of the reaction are mainly dibenzofuran, xanthenone, 6H-benzo[c]chromen-6-one, 6-phenyl-6H-benzo[c]chromene, and 1,3-diphenyl-1, 3-dihydro-2-benzofuran.
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| 关 键 词： | 合成 分解反应 稀土元素 水杨酸酯 流变相 热重分析 红外光谱 |
Synthesis and Thermal Decomposition Mechanism of Rare Earth (RE=La, Y, Gd) Salicylates |
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| LI,Liang-Chao,a ZHOU,Xiang-Chunb. Synthesis and Thermal Decomposition Mechanism of Rare Earth (RE=La, Y, Gd) Salicylates[J]. Chinese Journal of Chemistry, 2004, 22(11): 1279-1282. DOI: 10.1002/cjoc.20040221113 |
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| Authors: | LI Liang-Chao a ZHOU Xiang-Chunb |
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| Affiliation: | LI,Liang-Chao*,a ZHOU,Xiang-Chunb |
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| Abstract: | The rare earth (RE=La, Y, Gd) salicylates were synthesized by the rheological phase reaction method. The complexes were characterized by elemental analysis, infrared spectra (IR), X-ray powder diffraction (XRD) and thermal gravity analysis (TG). They can be represented by general formula RE(HSal)3 (RE=La, Y, Gd; HSal=C6H4(OH)COO). The crystals of them are monoclinic and have layered structure. The mechanism of thermal de-composition of rare earth salicylates was studied by using TG, DTA, IR and gas chromatography-mass spectrometry (GC-MS). The thermal decomposition of the rare earth salicylates in nitrogen gas proceeded in three stages: firstly, they were decomposed to form RE2(Sal)3 (Sal=C6H4OCOO) and salicylic acid; then, RE2(Sal)3 were decomposed further to form RE2O(CO3)2 and some organic compounds; finally, RE2O(CO3)2 were decomposed to form rare earth metal oxides (RE2O3) and carbon dioxide. The organic compounds obtained from the second step of the reac-tion are mainly dibenzofuran, xanthenone, 6H-benzo[c]chromen-6-one, 6-phenyl-6H-benzo[c]chromene, and 1,3-diphenyl-1, 3-dihydro-2-benzofuran. |
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| Keywords: | rare earth salicylate rheological phase thermal decomposition |
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