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Separation of enantiomers by their enantiospecific interaction with achiral magnetic substrates

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.

Authors:   Koyel Banerjee-Ghosh; Oren Ben Dor; Francesco Tassinari; Eyal Capua; Shira Yochelis; Amir Capua; See-Hun Yang; Stuart S. P. Parkin; Soumyajit Sarkar; Leeor Kronik; Lech Tomasz Baczewski; Ron Naaman; Yossi Paltiel
Journal:   Science
Volume:   360
edition:   6395
Year:   2018
Pages:   1331
DOI:   10.1126/science.aar4265
Publication date:   22-Jun-2018
Facts, background information, dossiers
  • molecules
  • electron spin
  • substrates
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