HIGH-PRESSURE HIGH-RESOLUTION NUCLEAR MAGNETIC RESONANCE. PRESSURE DEPENDENCE OF THE RING PROTON CHEMICAL SHIFTS OF SUBSTITUTED BENZENES
HIGH-PRESSURE HIGH-RESOLUTION NUCLEAR MAGNETIC RESONANCE. PRESSURE DEPENDENCE OF THE RING PROTON CHEMICAL SHIFTS OF SUBSTITUTED BENZENES
复制标题
高压高分辨率核磁共振。
DOI：
10.1002/chin.197733049
复制
发表时间：
1977
期刊：
影响因子：
--
通讯作者：
Kazuko Otsuka
中科院分区：
文献类型：
--
作者：
H. Yamada;Chiharu Itani;Kazuko Otsuka
摘要;用100 MHz高分辨光谱仪测量了正己烷中1，4-二取代苯相对于内苯的环质子化学位移随压力的变化。随着压力的增加，质子共振向高场的位移被解释为取代基的空间效应，它部分地阻碍了介质分子接近取代基邻位的共振质子。大多数液体有机化合物，当压缩到103 kg cm-2的压力区域时，在1个大气压下被迫损失其体积的10-15%，从而导致分子间分离的收缩。这种收缩加强了介质分子与通常位于有机分子表面的氢原子之间的接触，引起了质子磁共振中所谓介质效应的变化。高压高分辨质子NMR 1 -2是研究高压下有机分子行为的一种很有吸引力的手段。在以前的文章中，我们报道了在60兆赫的标准高分辨谱仪上，在高达2000公斤/厘米~（-2）的加压条件下，进行的高分辨核磁共振实验。
Abstract; Pressure dependence of the ring proton chemical shiftsof 1, 4-disubstituted benzenes relative to the internal benzene has been measuredin zt-hexane up to 2000 kg cm-2 using a 100-MHz high-resolution spectrometer. The observed displacement of the proton resonance to high field, with increasing pressure, has been interpreted in terms of the substituent steric effect, which hinders partly the approach of medium molecule to the resonating proton ortho to thesubstituent.Most of the liquid organic compounds, whencompressed to a pressure region of the order of 103 kg cm-2, are forced to lose 10-15% of their volumes at 1 atm with the resultant con-traction of intermolecular separations. This contraction in-tensifies the contacts between medium molecules and hydrogen atoms which are located normally on the surfaces of the or-ganic molecules, giving rise to change in the so-called medium effect on the proton magnetic resonance. The high-pressure high-resolution proton NMR1-2 thus appears to be a very at-tractive means for studying the behavior of the organic mole-cule under high pressure. In preceding papers, we reported the high-resolution NMR experiments under the increased pres-sures up to 2000 kg cm-2 carried out on a standard high-resolution spectrometer1 bde operating at 60 MHz with some