(CH(3))(4)NPF(6) is studied by NMR measurements to understand the internal motions and cross relaxation mechanism between the heterogeneous nuclei. The spin lattice relaxation times (T(1)) are measured for (1)H and (19)F nuclei, at three (11.4, 16.1 and 21.34 MHz) Larmor frequencies in the temperature range 350-50K and (1)H NMR second moment measurements at 7 MHz in the temperature range 300-100K employing home made pulsed and wide-line NMR spectrometers. (1)H NMR results are attributed to the simultaneous reorientations of both methyl and tetramethylammonium groups and motional parameters are evaluated. (19)F NMR results are attributed to cross relaxation between proton and fluorine and motional parameters for the PF(6) group reorientation are evaluated.

中文翻译：

---

通过（1）H和（19）F NMR研究六氟磷酸四甲铵（CH（3））（4）NPF（6）中的分子动力学和交叉弛豫。

（CH（3））（4）NPF（6）通过NMR测量研究，以了解异质核之间的内部运动和交叉弛豫机制。在350-50K温度范围内的三个拉莫尔频率（11.4、16.1和21.34 MHz）下测量（1）H和（19）F核的自旋晶格弛豫时间（T（1））使用自制的脉冲和宽线NMR光谱仪在300-100K的温度范围内，在7 MHz下进行第二矩测量。（1）1 H NMR结果归因于甲基和四甲基铵基团的同时重新取向，并且评价了运动参数。（19）F NMR结果归因于质子和氟之间的交叉弛豫，并评估了PF（6）基团重新定向的运动参数。