Kernresonanzen in kristallinen Flüssigkeiten und in kristallinflüssigen Lösungen. Teil I
Kernresonanzen in kristallinen Flüssigkeiten und in kristallinflüssigen Lösungen. Teil I
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泰尔一世
DOI：
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发表时间：
1964
期刊：
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通讯作者：
A. Saupe
中科院分区：
文献类型：
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作者：
A. Saupe
本文对液晶和液晶溶液中的核磁共振进行了理论研究。液晶中分子的平均有序性，就其对核共振研究的重要性而言，可以用对称矩阵来描述。借助于这个矩阵，有效平均自旋哈密顿的耦合常数可以用属于固定分子取向的常数来表示。在实验工作中，液晶中的溶液是最有用的。在这样的溶液中，可以获得高分辨率的光谱取向溶质分子没有任何干扰的分子间的核偶极-偶极相互作用。可以得到分子内偶极-偶极相互作用、化学位移各向异性和四极相互作用的精确信息。如果分子结构是充分已知的，则可以确定有序矩阵。在有利的情况下，还可以确定间接自旋-自旋耦合常数的绝对符号。
A theoretical study of nuclear magnetic resonances in liquid crystals and in liquid crystalline solutions is given. The average ordering of the molecules in liquid crystals, as far as it is of importance for nuclear resonance researches, can be described by a symmetrical matrix. With the help of this matrix the coupling constants of the effective average spin HAMiLTONIAN can be expressed by the constants belonging to a fixed molecular orientation. For experimental work solutions in nematic liquid crystals are most useful. In such solutions high resolution spectra of the orientated solute molecules can be gained without any disturbance by intermolecular nuclear dipole-dipole interaction. Precise informations can be obtained on the intra-molecular dipole-dipole interaction, the anisotropy of chemical shift, and the quadrupole interaction. The matrix of order can be determined if the molecular structure is sufficiently known. In favorable cases the absolute sign of the indirect spin-spin coupling constants can also be determined.