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Issue 20, 2019
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Enantioseparation by crystallization using magnetic substrates

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Abstract

Enantiospecific crystallization of the three amino acids asparagine (Asn), glutamic acid hydrochloride (Glu·HCl) and threonine (Thr), induced by ferromagnetic (FM) substrates, is reported. The FM substrates were prepared by evaporating nickel capped with a thin gold layer on standard silicon wafers. Magnets were positioned underneath the substrate with either their North (N) or South (S) poles pointing up. Asymmetric induction, controlled by the magnetic substrates, was demonstrated for the crystallization of the pure enantiomers and was then extended for the racemic mixtures of Asn and Glu·HCl. In the case of the solution of the pure enantiomers, the L enantiomer was crystallized preferentially at one pole of the magnet and the D enantiomer at the other. Consequently, the racemates of Asn and Glu·HCl undergo separation under the influence of the magnetic substrate. With Thr, however, despite the enantiospecific interactions of the pure enantiomers with the FM, no separation of the emerging crystals could be achieved with the racemates, although they crystallize as conglomerates, implying differences taking place in the crystallization step. The results reported here are not directly related to the magnetic field, but rather to the aligned spins within the ferromagnets. The findings provide a novel method for resolving enantiomers by crystallization and offer a new perspective for a possible role played by magnetic substrates regarding the origin of chirality in nature.

Graphical abstract: Enantioseparation by crystallization using magnetic substrates

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Publication details

The article was received on 07 Feb 2019, accepted on 08 Apr 2019 and first published on 10 Apr 2019


Article type: Edge Article
DOI: 10.1039/C9SC00663J
Chem. Sci., 2019,10, 5246-5250
  • Open access: Creative Commons BY license
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    Enantioseparation by crystallization using magnetic substrates

    F. Tassinari, J. Steidel, S. Paltiel, C. Fontanesi, M. Lahav, Y. Paltiel and R. Naaman, Chem. Sci., 2019, 10, 5246
    DOI: 10.1039/C9SC00663J

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