| 无水烟酸锂的合成、结构表征及热化学性质 |
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| 引用本文： | 淡文彦,邸友莹,杨伟伟,朱琳,孔玉霞,龚树文,何东华.无水烟酸锂的合成、结构表征及热化学性质[J].化学学报,2009,67(10):1033-1041. |
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| 作者姓名： | 淡文彦 邸友莹 杨伟伟 朱琳 孔玉霞 龚树文 何东华 |
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| 作者单位： | 聊城大学化学化工学院,聊城,252059 |
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| 摘 要： | 选择分析纯烟酸和一水氢氧化锂为反应物, 利用水热合成方法合成了无水烟酸锂. 利用FTIR和X射线粉末衍射等方法表征了它的结构. 用精密自动绝热热量计测定了它在78～400 K温区的低温热容, 将该温区的摩尔热容实验值用最小二乘法拟合, 得到热容随温度变化的多项式方程. 用此方程进行数值积分, 得到温区内每隔5 K的舒平热容值和相对于298.15 K时的各种热力学函数值. 在此基础上, 通过设计合理的热化学循环, 利用等温环境溶解-反应热量计分别测定该反应的反应物和生成物在所选溶剂中的溶解焓, 从而得到此反应的反应焓为: ＝－(20.21±0.41) kJ• mol－1. 最后, 依据Hess定律计算出无水烟酸锂的标准摩尔生成焓为: Li(C6H4NO2), s]＝－(278.29±1.01) kJ•mol－1.
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| 关 键 词： | 无水烟酸锂 绝热量热法 低温热容 等温环境溶解-反应量热法 标准摩尔生成焓 |
| 收稿时间： | 2008-11-12 |
| 修稿时间： | 2008-12-7 |
Synthesis, Characterization and Thermochemistry of Anhydrous Lithium Nicotinate |
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| Dan Wenyan,Di Youying,Yang Weiwei,Zhu Lin,Kong Yuxia,Gong Shuwen,He Donghua.Synthesis, Characterization and Thermochemistry of Anhydrous Lithium Nicotinate[J].Acta Chimica Sinica,2009,67(10):1033-1041. |
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| Authors: | Dan Wenyan Di Youying Yang Weiwei Zhu Lin Kong Yuxia Gong Shuwen He Donghua |
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| Institution: | College of Chemistry and Chemical Engineering;Liaocheng University;Liaocheng 252059 |
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| Abstract: | Nicotinic acid and lithium hydroxide monohydrate were chosen as the reactants, anhydrous lithium nicotinate was synthesized by the method of hydrothermal synthesis. FTIR and X-ray powder diffraction techniques were applied to characterize its structure. Low-temperature heat capacities of the Li(C6H4NO2)(s) were measured with a small sample precision automated adiabatic calorimeter over the temperature range from 78 to 400 K. A polynomial equation of the heat capacities as a function of temperature was fitte... |
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| Keywords: | anhydrous lithium nicotinate adiabatic calorimetry low-temperature heat capacity isoperibol solution-reaction calorimetry standard molar enthalpy of formation |
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