二维魔角旋转核磁共振自旋回波实验：固态纤维素样品中¹³C-¹³C J 耦合的测定

The 2D MAS NMR spin-echo experiment: the determination of 13C-13C J couplings in a solid-state cellulose sample.

作者信息

Brown Steven P, Emsley Lyndon

机构信息

Department of Physics, University of Warwick, Coventry CV4 7AL, UK.

出版信息

J Magn Reson. 2004 Nov;171(1):43-7. doi: 10.1016/j.jmr.2004.07.022.

DOI:10.1016/j.jmr.2004.07.022

PMID:15504680

Abstract

A simple 13C MAS spin-echo experiment is applied to a partially 13C-labelled cellulose sample extracted from wood. 13C-13C J couplings are determined even though considerable chemical disorder leads to observed linewidths in the normal 1D 13C CP MAS spectrum which far exceed the J couplings. The fitting of the experimental data also allows the quantification of the degree of isotopic enrichment.

摘要

一个简单的13C 魔角旋转自旋回波实验应用于从木材中提取的部分13C标记的纤维素样品。尽管相当大的化学无序导致在正常的一维13C交叉极化魔角旋转光谱中观察到的线宽远远超过J耦合，但仍可确定13C-13C J耦合。对实验数据的拟合还可以对同位素富集程度进行量化。