Identifying Enantiomers in Mixtures of Chiral Molecules with Broadband Microwave Spectroscopy
Identifying Enantiomers in Mixtures of Chiral Molecules with Broadband Microwave Spectroscopy
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DOI：
10.1002/anie.201306271
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发表时间：
2014-01-20
影响因子：
16.6
通讯作者：
Schnell, Melanie
中科院分区：
文献类型：
--
作者：
Shubert, V. Alvin;Schmitz, David;Schnell, Melanie
对香芹酮对映体和构象异构体的混合物进行手性敏感宽带微波光谱分析，以区分对映体、测量对映体过量并确定对映体的绝对构型。该方法使用微波三波混合，本质上非常适合混合物分析，这是优于其他技术的独特优势。与传统的微波光谱相比，还利用了接收信号的相位。该阶段取决于分子偶极矩分量的符号，用于识别过量的对映体。测得的信号幅度决定了超出量的大小。光谱仪的宽带功能用于同时激发和测量香芹酮的两个构象异构体，演示了对具有多个手性物质的样品的分析。利用量子化学计算和测量的相，确定对映体的绝对构型。
Chirality-sensitive broadband microwave spectroscopy was performed on mixtures of carvone enantiomers and conformers to distinguish enantiomers, measure enantiomeric excesses, and determine the absolute configurations of the enantiomers. This method uses microwave three-wave mixing and is inherently well-suited to the analysis of mixturesa unique advantage over other techniques. In contrast to conventional microwave spectroscopy, the phase of the received signal is also exploited. This phase depends upon the signs of the molecules' dipole-moment components and is used to identify the excess enantiomer. The measured signal amplitude determines the size of the excess. The broadband capabilities of the spectrometer were used to simultaneously excite and measure two conformers of carvone, demonstrating the analysis of a sample with multiple chiral species. Employing quantum chemical calculations and the measured phases, the absolute configurations of the enantiomers are determined.