Two Spectroscopies in One: Interference of Circular Dichroism and Raman Optical Activity.,Angewandte Chemie International Edition

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Two Spectroscopies in One: Interference of Circular Dichroism and Raman Optical Activity.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-09-14 , DOI: 10.1002/anie.202011146
Tao Wu ₁ , Guojie Li ₂ , Josef Kapitán ₃ , Jiří Kessler ₁ , Yunjie Xu ₂ , Petr Bouř ₁

Affiliation

Previously, we and other laboratories have reported an unusual and strong Raman optical activity (ROA) induced in solvents by chiral dyes. Various theories of the phenomenon appeared, but they were not capable of explaining fully the observed ROA band signs and intensities. In this work, an analysis based both on the light scattering theory and dedicated experiments provides a more complete understanding. For example, double‐cell magnetic circular dichroism and magnetic ROA experiments with copper‐porphyrin complex show that the induced chirality is observed without any contact of the solvents with the complex. The results thus indicate that a combination of electronic circular dichroism (ECD) with the polarized Raman scattering is responsible for the effect. The degree of circularity of solvent vibrational bands is a principal molecular property participating in the event. The insight and the possibility to predict the chirality transfer promise future applications in spectroscopy, chemical analysis and polarized imaging.

中文翻译：

两种光谱合二为一：圆二色性和拉曼光学活性的干涉。

此前，我们和其他实验室曾报道过手性染料在溶剂中诱导出不寻常且强烈的拉曼光学活性（ROA）。关于这一现象出现了各种理论，但它们无法完全解释观察到的 ROA 带符号和强度。在这项工作中，基于光散射理论和专门实验的分析提供了更完整的理解。例如，铜-卟啉复合物的双池磁性圆二色性和磁性 ROA 实验表明，在溶剂与复合物没有任何接触的情况下，可以观察到诱导手性。因此，结果表明电子圆二色性（ECD）与偏振拉曼散射的组合是造成这种效应的原因。溶剂振动带的圆度是参与该事件的主要分子性质。预测手性转移的洞察力和可能性有望在光谱学、化学分析和偏振成像中得到未来的应用。

更新日期：2020-09-14

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