波谱学杂志 ›› 1997, Vol. 14 ›› Issue (6): 485-490.

• 研究论文 • 上一篇    下一篇

1H NMR测定吡啶和2,6-二甲基吡啶的pKa和热力学参数

杨绪杰, 黄海荣, 刘劲松, 刘孝恒, 陆路德, 汪信   

  1. 南京理工大学化工学院, 南京 210094
  • 收稿日期:1997-05-12 修回日期:1997-06-20 出版日期:1997-12-05 发布日期:2018-01-22
  • 通讯作者: 杨绪杰,男,50岁,硕士,副教授

DETERMINATION OF pKa VALUES AND THERMODYNAMIC PARAMETER OF PYRIDINE AND 2,6-LUTIDINE BY 1H NMR

Yang Xujie, Huang Hairong, Liu Jinsong, Liu Xiaoheng, Lu Lude, Wang Xin   

  1. School of Chemical Engineering, Nanjing University of Sciences and Technology, Nanjing 210094
  • Received:1997-05-12 Revised:1997-06-20 Online:1997-12-05 Published:2018-01-22

摘要: 实验中配制一系列不同pH值的吡啶和2,6-二甲基吡啶的水溶液,用80MHz核磁共振谱仪测定每个pH点的核磁共振图谱.根据平衡常数与pH值及离子浓度的关系,可以计算出pKa的值.改变体系的实验温度,可以得到热力学参数△H、△S和△G的值.研究结果表明,核磁共振的方法是可靠的,它比传统的pH滴定方法测定pKa值的方法简单得多.

关键词: 1H NMR, 杂环碱化合物, pKa, 热力学参数

Abstract: In this experiment, a series of the pyridine and 2,6-lutidine solutions with different pH values were preparcd, then the 1H spectrum of each sample was measured with a 80MHz NMR spectrometer.Therefore, the pKa values depending on both the pH value and ionic concentration of the solution were calculated and thermodynamic parameters △G, △H and △S were obtained according to the data gotten through changing the experimental temperature of the system.It is shown that the NMR method is reliable and more convenient than conventional pH method when applied to the determination of pKa and thermodynamic parameters of pyridine and 2,6-lutidine solutions.

Key words: 1H NMR, Pyridine compound, pKa, Thermodynamic parameter