研究塑性有机固体的1H NMR方法

塑性有机固体的＾１Ｈ ＭＡＳ ＮＭＲ谱通常由一高分辨谱与一宽线谱组成，其中高分辨谱分量对应于塑性相，而宽线谱分量对应于刚性相。长延迟回波－ＭＡＳ ＮＭＲ实验可测得塑性相的高分辨谱，ＣＲＡＭＰＳ方法可测得整个固体＾１Ｈ体系的高分辨谱，常温下它往往以刚性相的贡献为主要成分。实验结果表明，结合＾１Ｈ ＭＡＳ、回波－ＭＡＳ与ＣＲＡＭＰＳ等三种固态高分辨＾１Ｈ ＮＭＲ技术可望成为深入研究塑性有机固体中塑性相

~1H NMR Studies of Plastic Organic Solids

The H MAS spectrum of a plastic organic solid is usually composed of a highresolution component and a broadline component. The high-resolution component corresponds to a plastic phase, while the broadline component corresponds to the rigid Phase. The high-resolution spectrum of the plastic phase can be observed by the echo-MAS experiment with a long ccho time; the high-resolution spectrum of the whole H system can be observed by the CRAMPS technique,mainly coming from the contribution of the rigid phase at usual temperature. It is shown that combination of CRAMPS with 1H MAS and echo-MAS is an effective way for studying the ratio of the plastic phase to the rigid phase, molecular st,ructure and states of motion in orgall]c solids.