RESEARCH OF LONG-RANGE COUPLING WITH TWO-DIMENSIONAL NMR SPECTROSCOPY AND MODIFIED COMPUTER PROGRAM

The ~(13)C-~1H long-range coupling constants of β-pyridine carboxylic ester are determined with the method of folding of two-dimensional NMR J spectroscopy and prove consistent with their simulated spectra. The modified computer program which can shorten the experimental time of heteronuclear two-dimensional J spectroscopy and improve the work is introduced. The experiment is performed on the Varian FT-80A NMR spectrometer.     

改进的ROESY技术及实验方法

本文介绍了对ROESY(CAMELSPIN)技术改进的脉冲序列的原理。这种改进的技术能有效的抑制偏共振效应的影响和提高谱的灵敏度。进行了1D和2D ROESY实验。实验结果表明,改进的ROESY实验能提高谱图灵敏度40%～80%,并能有效地压制其它2D响应信号。     

用二维核磁共振谱研究远程耦合及计算机程序的改进

本文用二维丁谱的折叠方法测定了β-吡啶甲酸乙酯的~(13)C—~3H远程耦合常数,并与它的模拟谱进行比较,二者符合得很好。本文还给出了旨在缩短异核二维J谱实验时间和改进工作的计算机的修改程序,并在FT-80A NMR波谱仪上进行了实验。