高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (5): 863.

• 研究快报 • 上一篇    下一篇

应用相敏HMQC和HSQC谱准确测定异核碳-氢偶合常数

丁克洋   

  1. 中国科学院广州化学研究所, 广州 510650
  • 收稿日期:2000-11-08 出版日期:2001-05-24 发布日期:2001-05-24
  • 通讯作者: 丁克洋(1962年出生),男,博士,副教授,主要从事核磁共振谱学及其应用研究.
  • 基金资助:

    中国科学院广州分院分析测试基金资助

Accurate Measurements of Heteronuclear 13C- 1H Coupling Constants by Phase-sensitive HMQC and HSQC Spectra

DING Ke-Yang   

  1. Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, China
  • Received:2000-11-08 Online:2001-05-24 Published:2001-05-24

关键词: 异核偶合常数, HMQC, HSQC, 反式检测, 核磁共振

Abstract: Phase sensitive HMQC(Heteronuclear Multiple-Quantum Coherence) and HSQC(Heteronuclear Single-Quantum Coherence) experiments with t1 noise reduction are proposed for the accurate measurement of heteronuclear one bond 13C1Hcoupling constants. The resulting 2D spectra give anti-phase splittings of heteronuclear one-bond couplings along ω2-dimension, so that the precision of coupling constant measurement is less subject to the residual t1-noise. By combining use of data-fitting procedure on a spectrum with enough digital resolution and signal-to-noise ratio, a precision of about 0.03 Hz can be achieved in the measurement of heteronuclear one-bond coupling constants. The proposed method can be very useful for the study of residual dipolar couplings caused by the alignment in high magnetic field and the dynamic frequency shift caused by the cross correlation between chemical shift and spin dipolar interactions.

Key words: Heteronuclear coupling constants, HMQC, HSQC, Inverse detection, NMR

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