波谱学杂志 ›› 1997, Vol. 14 ›› Issue (3): 257-261.

• 研究论文 • 上一篇    下一篇

化学位移的规律和本质

李临生   

  1. 西北轻工业学院应用化学研究所, 陕西咸阳 712081
  • 收稿日期:1996-10-15 修回日期:1996-12-09 出版日期:1997-06-05 发布日期:2018-01-22
  • 作者简介:李临生,男,56岁,教授

RULE AND ESSENCE OF CHEMICAL SHIFT

Li Linsheng   

  1. Institute of Applied Chemistry, Nothwest Institute of Light Industry, Xianyang Shanxi 712081
  • Received:1996-10-15 Revised:1996-12-09 Online:1997-06-05 Published:2018-01-22

摘要: 讨论了计算化学位移的通式及其中基值和参数的变化规律,根据确定的去屏蔽参数与基因电负性的关系式和基值的变化规律,提出核周电子密度QN是决定化学位移主要原因的观点.

关键词: 核磁共振, 化学位移, 去屏蔽参数, 氢谱, 碳谱, 核周电子密度

Abstract: The basic values and parameters in the formulas for calculating chemical shifts and their relationship to molecular structure were discussed. The results reveal that the main factor to influence chemical shifts of a spill nuclei was the electron cloud density around the nuclei (including the electron cloud distribution).

Key words: NMR, Chemical shift, Deshielding parameters, Electron density around nuclei