Separation of enantiomers by their enantiospecific interaction with achiral magnetic substrates
Separation of enantiomers by their enantiospecific interaction with achiral magnetic substrates
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DOI：
10.1126/science.aar4265
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发表时间：
2018-06-22
期刊：
影响因子：
56.9
通讯作者：
Paltiel, Yossi
中科院分区：
文献类型：
--
作者：
Banerjee-Ghosh, Koyel;Ben Dor, Oren;Paltiel, Yossi
通常认为，在自然界和人工系统中，手性的识别和区分仅取决于空间效应。然而，最近的研究表明，在手性分子中的电荷重新分配表现出对映体的电子自旋取向的偏好。因此，我们推断，诱导的自旋极化可能会影响通过交换相互作用的对映体识别。在这里，我们实验表明，手性分子与垂直磁化基板的相互作用是对映体特异性。因此，当磁偶极子指向上时，一种对映体优先吸附，而另一种对映体在磁化方向相反时吸附得更快。这种相互作用不是由磁场本身控制的，而是由电子自旋方向控制的，这为对映体分离开辟了一个独特的途径。
It is commonly assumed that recognition and discrimination of chirality, both in nature and in artificial systems, depend solely on spatial effects. However, recent studies have suggested that charge redistribution in chiral molecules manifests an enantiospecific preference in electron spin orientation. We therefore reasoned that the induced spin polarization may affect enantiorecognition through exchange interactions. Here we show experimentally that the interaction of chiral molecules with a perpendicularly magnetized substrate is enantiospecific. Thus, one enantiomer adsorbs preferentially when the magnetic dipole is pointing up, whereas the other adsorbs faster for the opposite alignment of the magnetization. The interaction is not controlled by the magnetic field per se, but rather by the electron spin orientations, and opens prospects for a distinct approach to enantiomeric separations.