Preparation of Electric Field-Applicable Solid State NMR Probe

本文设计了一种新型的核磁共振探针，用于在电场作用下测量固体核磁共振光谱。利用大功率放大器对光谱进行观测。样品在dyfron板容器中。样品台安装在角头上，以便台可以旋转。因此，电场可以在-90°- +90°的磁场范围内作用于样品。为了避免热量的散发，冷却的空气由管道输送到舞台。安装高压快速电放大器，可对样品施加0-500 V的直流电压。利用探针测量了4-氰基-4′-n-戊基联苯（5CB）的^<13>C核磁共振波谱，在室温下，通过逐步增加电场，显示出向列液晶相。所得光谱与先前报道的5CB的局部运动和电子结构相吻合。此外，我们还使用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.