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Pathways to increase the dissymmetry in the interaction of chiral light and chiral molecules

Abstract

The dissymmetric interaction between circularly polarised (CP) light and chiral molecules is central to a range of areas, from spectroscopy and imaging to next-generation photonic devices. However, the selectivity in absorption or emission of left-handed versus right-handed CP light is low for many molecular systems. In this Perspective, we assess the magnitude of the measured chiroptical response for a variety of chiral systems, ranging from small molecules to large supramolecular assemblies, and highlight the challenges towards enhancing chiroptical activity. We explain the origins of low CP dissymmetry and showcase recent examples in which molecular design, and the modification of light itself, enable larger responses. Our discussion spans spatial extension of the chiral chromophore, manipulation of transition dipole moments, exploitation of forbidden transitions and creation of macroscopic chiral structures; all of which can increase the dissymmetry. Whilst the specific strategy taken to enhance the dissymmetric interaction will depend on the application of interest, these approaches offer hope for the development and advancement of all research fields that involve interactions of chiral molecules and light. 

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Article information


Submitted
26 Apr 2021
Accepted
20 May 2021
First published
21 May 2021

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2021, Accepted Manuscript
Article type
Perspective

Pathways to increase the dissymmetry in the interaction of chiral light and chiral molecules

J. Greenfield, J. Wade, J. Brandt, X. Shi, T. Penfold and M. Fuchter, Chem. Sci., 2021, Accepted Manuscript , DOI: 10.1039/D1SC02335G

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