波谱学杂志 ›› 2000, Vol. 17 ›› Issue (2): 115-120.

• 研究论文 • 上一篇    下一篇

榄香烯及其衍生物的计算化学研究I β-榄香烯13C NMR化学位移的理论计算

叶金星, 程国宝, 胡皆汉   

  1. 中国科学院大连化学物理研究所, 大连 116011
  • 收稿日期:1999-11-29 修回日期:2000-01-11 出版日期:2000-04-05 发布日期:2018-01-11
  • 作者简介:叶金星,男,1975年出生,广西大学化学化工学院在读硕士生

STUDY ON COMPUTATIONAL CHEMISTRY OF ELEMENE AND ITS DERIVATIVES I Theoretical Calculation of 13C NMR Chemical Shifts of β-elemene

YE Jinxing, CHENG Guobao, HU Jiehan   

  1. Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116011
  • Received:1999-11-29 Revised:2000-01-11 Online:2000-04-05 Published:2018-01-11

摘要: 报道了抗癌新药β-榄香烯的13C NMR化学位移的量子化学计算.在分子力学MMX和量子化学RHF/6-31G*或B3LYP/6-31G*优化结构的基础上进行了两种规范变换方法GIAO和CSGT的Hartree-Fock和B3LYP (6-31G*基组)的化学位移计算.并对计算结果进行了误差分析和线性相关分析.所有的这些结果中,采用GIAO规范变换方法都好于CSGT,而以GIAO-B3LYP/6-31G*//B3LYP/6-31G*计算的结果最好,RMS为4.3ppm,相关系数R2为0.998,SD为2.42 ppm.而GIAO-B3LYP/6-31G*//MMX是一种能兼顾计算时间和计算精度的方法,其RMS、R2和SD分别为4.9、0.996和3.0 4 ppm.

关键词: 化学位移, β-榄香烯, 量子化学计算, 分子力学

Abstract: 13C NMR chemical shifts of a new drug for antitutor-β-elemene have been studied by quantum chemical calculation. The calculations both at the ab initio Hartree-Fock and B3LYP density function level of theory (6-31G*) at the molecular mechanics MMX and Quantum chemistry RHF/6-31G*(or B3LYP/6-31G*) optimized geometry have been implemented. Comparisons of both error analysis and linear correlation analysis have been performed between the theoretical and experimental chemical shifts. The results using GIAO gauge transformation method are better than those using CSGT method. The results using GIAO-B3LYP/6-31G*//B3LYP/6-31G* level are the best, with RMS of 4.3ppm, correlation coefficient R2 of 0.998, SD of 2.42ppm. GIAO B3LYP/6-31G*//MMX is a good method of counterpoising between the computational expense and accuracy of results, with RMS of 4.9ppm, R2 of 0.996, SD of 3.04ppm.

Key words: Chemical shift, β-elemene, Quantum chemical calculation, Molecular mechanics