Measuring 13C-170 and 13C-14N Distances in Solids; NMR Technique Development

在这个由实验物理化学计划支持的项目中， 在化学部，Gullion将开发一种高分辨率的 魔角旋转核磁共振技术，允许测量 偶极核和四极核之间的核间距。 专门定制的脉冲序列与样品旋转同步 将重新耦合所需自旋对之间的偶极相互作用， 提供复杂固体的结构信息， 方式 第一个应用程序将被绑定到 以及涉及纤维素与水和纤维素的聚合物共混物， 聚丙烯腈。 这些实验将填补MAS NMR的空白 距离测量技术。 固态核磁共振技术类似于那些正在开发的这项工作 已经被应用于许多有趣的化学系统，包括 生物固体、沸石和聚合物。 因此，他们证明了 重要性和广泛的适用性，这些结构技术， 不同领域的材料科学，结构生物学，和研究 催化体系

In this project supported by the Experimental Physical Chemistry Program of the Chemistry Division, Gullion will develop a high-resolution magic-angle spinning NMR technique which allows measurement of internuclear distances between dipolar and quadrupolar nuclei. Specifically tailored pulse trains synchronized with the sample rotation will recouple the dipolar interactions between the desired spin pairs, providing structural information of complex solids in a straightforward manner. The first applications will be to the interactions between bound water and cellulose as well as to a polymer blend of cellulose with polyacrylonitrile. These experiments will fill a void in MAS NMR distance-measuring techniques. Solid-state NMR techniques similar to those being developed in this work have been applied to a number of interesting chemical systems, including biological solids, zeolites, and polymers. As such, they demonstrate the importance and wide applicability of these structural techniques to such diverse areas as materials science, structural biology, and the study of catalytic systems.