波谱学杂志 ›› 2019, Vol. 36 ›› Issue (1): 65-73.doi: 10.11938/cjmr20182656

• 研究论文 • 上一篇    下一篇

13C NMR化学位移测定值确定烷烃生成焓

武亚新1, 曹晨忠2, 滕丽丽2   

  1. 1. 南华大学 化学化工学院, 湖南 衡阳 421001;
    2. 湖南科技大学 化学化工学院, 理论有机化学与功能分子教育部重点实验室, 湖南 湘潭 411201
  • 收稿日期:2018-05-24 出版日期:2019-03-05 发布日期:2019-02-26
  • 通讯作者: 武亚新,Tel:0734-8282375,E-mail:wyx1981719@163.com;曹晨忠,Tel:0731-58291336,E-mail:czcao@hnust.cn E-mail:wyx1981719@163.com;czcao@hnust.cn
  • 基金资助:
    国家自然科学基金资助项目(21272063,21672058);湖南省自然科学基金资助项目(2015JJ6097);湖南省教育厅基金资助项目(13C813).

Estimation of Formation Enthalpy for Alkanes from 13C NMR Chemical Shifts

WU Ya-xin1, CAO Chen-zhong2, TENG Li-li2   

  1. 1. School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China;
    2. Key Laboratory of Theoretical Organic Chemistry and Functional Molecular Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
  • Received:2018-05-24 Online:2019-03-05 Published:2019-02-26

摘要: 本文通过分析烷烃核磁共振碳谱(13C NMR)化学位移与生成焓之间的关系,提出由13C NMR化学位移的测定值来确定烷烃生成焓的新方法.用53个烷烃分子的13C NMR化学位移总和(SCS)、三键数(P3)以及碳原子数目(n)与生成焓实验值进行相关,所得回归方程的相关性良好(相关系数R=0.998 2,标准偏差S=3.5 kJ/mol).进而,通过随机抽样和留一法证实该方程具有良好的稳定性和预测能力.将烷烃13C NMR化学位移与其生成焓定量联系起来,不仅有利于深入理解分子结构与性能关系,还为预测那些难于测定且费时的物理化学性质提供了新思路.

关键词: 烷烃, 生成焓, 核磁共振碳谱(13C NMR), 化学位移, 三键数(P3)

Abstract: The quantitative relationship between the 13C NMR chemical shifts of alkanes and their formation enthalpy was studied. A new approach for calculating the formation enthalpy from the 13C NMR chemical shifts was proposed. The experimentally measured formation enthalpy values of 53 alkanes were correlated with the parameters SCS (the sum of chemical shift),P3 (path counts of length three bounds) and n (the number of carbon atoms). The regression results showed a good correlation (R=0.998 2,S=3.5 kJ/mol). The random sampling method and leave-one-out method were used to verify the stability and prediction ability of the model.

Key words: alkanes, formation enthalpy, 13C NMR, chemical shift, path counts of length three bounds (P3)

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