False Chirality, Absolute Enantioselection and <i>CP</i> Violation: Pierre Curie’s Legacy

The 1884 suggestion of Pierre Curie (1859&#8722;1906) that the type of dissymmetry shown by collinear electric and magnetic fields may induce an enantiomeric excess, in a chemical reaction that would otherwise produce a racemic mixture, is explored in the context of fundamental symmetry argument...

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Bibliographic Details
Main Author: Laurence D. Barron
Format: Article
Language:English
Published: MDPI AG 2020-01-01
Series:Magnetochemistry
Subjects:
Online Access:https://www.mdpi.com/2312-7481/6/1/5
Description
Summary:The 1884 suggestion of Pierre Curie (1859&#8722;1906) that the type of dissymmetry shown by collinear electric and magnetic fields may induce an enantiomeric excess, in a chemical reaction that would otherwise produce a racemic mixture, is explored in the context of fundamental symmetry arguments. Curie&#8217;s arrangement exhibits false chirality (time-noninvariant enantiomorphism), and so it may not induce absolute enantioselection (ae) in a process that has reached thermodynamic equilibrium, since it does not lift the degeneracy of chiral enantiomers. However, it may do so in far-from-equilibrium processes via a breakdown in microscopic reversibility analogous to that observed in elementary particle processes under the influence of <i>CP</i> violation, the associated force possessing false chirality with respect to <i>CP</i> enantiomorphism. In contrast, an influence like circularly polarized light exhibiting true chirality (time-invariant enantiomorphism) lifts the degeneracy of enantiomers, and so may induce ae in all circumstances. Although to date, ae has not been observed under the influence of Curie&#8217;s arrangement of collinear electric and magnetic fields, it is argued that two different experiments have now demonstrated ae under a falsely chiral influence in systems far from equilibrium, namely in a spinning sample under a gravitational field, and in the separation of enantiomers at a ferromagnetic surface.
ISSN:2312-7481