The Detection and Reactivity of Silanols and Silanes Using Hyperpolarized
<sup>29</sup>
Si Nuclear Magnetic Resonance
作者:Peter J. Rayner、Peter M. Richardson、Simon B. Duckett
DOI:10.1002/anie.201915098
日期:2020.2.10
Silanols and silanes are key precursors and intermediates for the synthesis of silicon‐based materials. While their characterization and quantification by 29Si NMR spectroscopy has received significant attention, it is a technique that is limited by the low natural abundance of 29Si and its low sensitivity. Here, we describe a method using p‐H2 to hyperpolarize 29Si. The observed signal enhancements
硅烷醇和硅烷是合成硅基材料的关键前体和中间体。虽然通过29 Si NMR 光谱对其进行表征和定量已受到极大关注,但该技术受到29 Si 自然丰度低及其灵敏度低的限制。在这里,我们描述了一种使用 p-H 2超极化29 Si 的方法。观察到的信号增强在 11.7 T 下接近 3000 倍,在玻尔兹曼条件下需要很多天的测量才能获得可比较的结果。利用所得信号来监测三(叔丁氧基)硅烷醇与三氟甲磺酸酐在T 1校正过程中的快速反应,从而实现快速定量。这些结果展示了一种量化硅材料合成中动态过程和中间体的新途径。