| 1-甲基-3,5-二苯基-吡唑的低温热容和热力学性质 |
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| 引用本文： | 邸友莹,孙晓红,刘源发,谭志诚,孟霜鹤,高胜利,屈松生.1-甲基-3,5-二苯基-吡唑的低温热容和热力学性质[J].化学学报,2001,59(4):496-501. |
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| 作者姓名： | 邸友莹 孙晓红 刘源发 谭志诚 孟霜鹤 高胜利 屈松生 |
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| 作者单位： | 武汉大学化学与环境科学学院;中国科学院大连化学物理研究所热化学实验室 |
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| 基金项目： | 国家自然科学基金(29573133,29773048)资助项目 |
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| 摘 要： | 通过精密自动绝热热量计测量了自己合成并提纯1-甲基-3,5-二苯基-吡唑在78～370K温区的摩尔热容。实验结果表明，这个化合物有一个固-液熔化相变，其熔化温度、摩尔熔化焓以及摩尔熔化熵分别为：(332.903±0.152)K,(17463.48±21.81)J·mol^-1和(52.55±0.06)J·mol^-1·K^-1。通过分步熔化法得到样品的纯度和绝对纯样品熔点分别为：0.9954(摩尔分数)和333.115K。在热容测量的基础上计算出了该物质每隔5K的热力学函数值。用DSC技术对该物质的固液熔化过程作了进一步研究，结果与热容实验相一致。
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| 关 键 词： | 吡唑P 比热 热力学性质 示差扫描量热法 |
| 修稿时间： | 2000年8月2日 |
Low-temperature heat capacities and thermodynamic properties of 1 methyl-3,5-diphenyl-pyrazole |
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| Di Youying,Sun Xiaohong,Liu Yuanfa,Tan Zhicheng,Meng Shuanghe,Gao Shengli,Qu Songsheng.Low-temperature heat capacities and thermodynamic properties of 1 methyl-3,5-diphenyl-pyrazole[J].Acta Chimica Sinica,2001,59(4):496-501. |
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| Authors: | Di Youying Sun Xiaohong Liu Yuanfa Tan Zhicheng Meng Shuanghe Gao Shengli Qu Songsheng |
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| Institution: | Northwest Univ, Dept Chem.Xian(710069) |
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| Abstract: | The heat capacities of 1-methyl-3,5-diphenyl- pyrazole have been precisely determined with a small sample precision automated adiabatic calorimeter over the temperature range from 78 to 370 K. A phase transition form solid to liquid is observed at the peak temperature of (332.903±0.152)K. The molar enthalpy and entropy of the phase transition as well as chemical purity of the substance are determined to be (17463.48±21.81)J·mol^-1,(52.55±0.06)J·K· mol^ 1 and 99.54%, respectively, on the basis of the heatcapacity measurements. The further research of solid-liquid phase transition for this compound has been carried out by means of DSC technique. |
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| Keywords: | PYRAZOLE P SPECIFIC HEAT THERMODYNAMIC PROPERTIES DIFFERENTIAL SCANNING CALORIMETRY |
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