Z-restored spin-echo 13C 1D spectrum of straight baseline free of hump, dip and roll.
Z-restored spin-echo 13C 1D spectrum of straight baseline free of hump, dip and roll.
复制标题
Z 轴恢复的自旋回波 13C 1D 光谱，具有无驼峰、倾斜和滚动的直线基线。
DOI：
10.1002/mrc.2195
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Gao,Xiaolian
中科院分区：
文献类型：
--
作者：
Xia,Youlin;Moran,Sean;Nikonowicz,EdwardP;Gao,Xiaolian
A pulse sequence of z‐restored spin echo, − π− β− τ− π− τ−, employing a π pulse in the middle of the delay (2τ) to form a spin echo and the two π pulses together to restore the residual longitudinal magnetization back to + z direction, is described.13C spectra of organic compounds provide a wealth of structural information; however,13C 1D spectra acquired using reverse geometry probes can have significant baseline humps or rolls because of pulse ring‐down within the coil. The baseline distortions are especially apparent in spectra acquired using cryogenically enhanced probes. The baseline problem may be alleviated by extending the delay between the last pulse and the starting point of acquisition. However, uses of long delay times introduce large negative first‐order phase corrections which themselves produce baseline roll. The prescribed experiment can be used to completely remove the hump, roll or dip in the baseline of the13C spectrum and at the same time obtain sensitivity similar to the experiment of a single β pulse. We believe that this experiment will be of general applications in acquiring high‐quality13C NMR data with reverse geometry probes and spectral interpretation. Copyright © 2008 John Wiley & Sons, Ltd.
