物理化学学报 >> 1991, Vol. 7 >> Issue (05): 618-622.doi: 10.3866/PKU.WHXB19910521

研究简报 上一篇    下一篇

聚合物异核交叉弛豫及二维NOE谱

晏欣; 王德华; 钱保功   

  1. 中国科学院武汉物理所波谱与原子分子物理开放研究实验室,武汉 430071
  • 收稿日期:1990-05-12 修回日期:1990-11-13 发布日期:1991-10-15
  • 通讯作者: 王德华

Heteronuclear Cross-Relaxation and Two-Dimensional NOE Spectra of Polymers

Yan Xin; Wang De-Hua; Qian Bao-Gong   

  1. Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics, Academia Sinica, Wuhan 430071
  • Received:1990-05-12 Revised:1990-11-13 Published:1991-10-15
  • Contact: Wang De-Hua

关键词: 13C自旋-晶格弛豫, 异核间的距离, 二维异核NOE谱, 聚(2,6-二甲基-1,4-苯醚), 聚异丁烯

Abstract: The heteronuclear cross-relaxation rates in polymers were determined by selective and conventional ~(13)C spin-lattice relaxation experiments, the proton-carbon distances were calculated by the theoretical formula, and two-dimensional NOE spectra of the polymers were also measured. The results showed that (1) the measured proton-carbon distances coincide with the distances from molecular models, (2) there is the observable dipolar cross-relaxation effect between the quaternary carbons and their neighboring protons, and (3) the optimum mixing times depend on the relaxation properties of the proton and carbon.

Key words: 13C spin lattice relaxation, Proton-Carbon distance, Two-dimensional heteronuclear NOE spectroscopy, Poly(2,6-dimethyl-1,4-phenyleneoxide), Polyisobutylene