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用NMR方法研究固体表面吸附可获得吸附分子活动性的动态信息,加深对吸附分子与固体表面相互作用力性质的了解。~13CNMR谱虽灵敏度低于~1H谱,但分辨率优于~1H谱,对吸附态分子可得中等分辨率的谱图。本文用~(13)CNMR方法研究吡啶(Py)和2,6-二甲基吡啶(DMPy)在SiO_2、Al_2O_3、NaY及HY上的吸附。比较NMR谱线的宽度,可知在不同吸附体系中处于吸附态的分子具有不同的活动性。推测了DMPy吸附时空间受阻情况及与表面相互作用力的性质。
Using NMR to study the dynamic information of adsorbable molecular activity obtained by adsorption on solid surface and to deepen the understanding of the nature of the interaction between adsorbed molecules and solid surface. The ~ 13CNMR spectrum has a lower sensitivity than the ~ 1H spectrum, but the resolution is better than the ~ 1H spectrum, which gives a medium resolution spectrum for the adsorbed molecules. In this paper, the adsorption of Py (Py) and 2,6-dimethylpyridine (DMPy) on SiO_2, Al_2O_3, NaY and HY was studied by ~ (13) CNMR method. Comparing the widths of NMR spectra shows that the molecules in the adsorbed state have different activities in different adsorption systems. It is speculated that DMPy adsorption space constraints and the nature of the interaction with the surface.