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Science. 2018 Jun 22;360(6395):1331-1334. doi: 10.1126/science.aar4265. Epub 2018 May 10.

Separation of enantiomers by their enantiospecific interaction with achiral magnetic substrates.

Author information

1
Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
2
Department of Applied Physics, Hebrew University, Jerusalem 91904, Israel.
3
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA.
4
Max Planck Institute for Microstructure Physics, Halle (Saale) D-06120, Germany.
5
Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel.
6
Institute of Physics Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warszawa, Poland.
7
Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel. ron.naaman@weizmann.ac.il paltiel@mail.huji.ac.il.
8
Department of Applied Physics, Hebrew University, Jerusalem 91904, Israel. ron.naaman@weizmann.ac.il paltiel@mail.huji.ac.il.

Abstract

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.

PMID:
29748324
DOI:
10.1126/science.aar4265

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