Preparation of Electric Field-Applicable Solid State NMR Probe

我们构建了一种新的核磁共振探针，用于测量电场作用下的固体核磁共振谱。用高功率放大器观察光谱。样品放在DYFRON板容器中。样品台安装在摇头中，以便台可以旋转。因此，电场可以施加到与磁场成-90°-+90°范围内的样品。为了避免放热，冷却空气由管子提供给舞台。安装了高压快速电子放大器，可对样品施加0-500V的直流电压。利用该探针，我们通过逐步增加电场，测量了4-氰基-4‘-正戊基联苯(5CB)的核磁共振谱，它在室温下显示向列型液晶相。得到的光谱与前人关于5CB的局域运动和电子结构的报道是一致的。此外，我们还利用该探针对具有客体包合能力的微孔配位聚合物进行了表征。

We have constructed a new NMR probe for the measurement of solid state NMR spectra under the electric field. The high-power amplifier was used for the observation of the spectra. The sample in the dyfron plate vessel. The sample stage was mounted in the goniohead so that the stage can be rotated. Consequently, the electric field can be applied to the sample in the region of -90 - +90°against the magnetic field. To avoid an evolution of heat, cooled air was supplied to the stage by the tube. High-voltage rapid electric amplifier was installed, which can apply direct voltage of 0-500 V to the sample. Using the probe, we have measured ^<13>C NMR spectra of 4-cyano-4'-n-pentylbiphenyl (5CB), which shows a nematic liquid crystal phase at room temperature, by stepwise increase of a electric field. The obtained spectra are found to be in good agreement with previous reports on a local motion and an electronic structures of 5CB. In addition we have used the probe to characterize microporous coordination polymers with guest inclusion ability.