Chiral supramolecular assembly to enhance the magneto-optical rotation of organic materials

Leo Delage-Laurin, David Reger, Abdusalom A. Suleymanov, Zachary Nelson, Louis Minion, Steven E. Kooi, Jochen R. Brandt, Giuliano Siligardi, Robert P. Cameron, Jessica Wade (), Timothy M. Swager () and Matthew J. Fuchter ()
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Leo Delage-Laurin: Massachusetts Institute of Technology
David Reger: Imperial College London
Abdusalom A. Suleymanov: Massachusetts Institute of Technology
Zachary Nelson: Massachusetts Institute of Technology
Louis Minion: Imperial College London
Steven E. Kooi: Massachusetts Institute of Technology
Jochen R. Brandt: Queen Mary University of London
Giuliano Siligardi: Harwell Science and Innovation Campus
Robert P. Cameron: University of Strathclyde
Jessica Wade: Imperial College London
Timothy M. Swager: Massachusetts Institute of Technology
Matthew J. Fuchter: Imperial College London

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract Connections between magnetic field induced optical activity and chirality have a rich and complicated history. Although the broken inversion symmetry of chiral molecules generates ‘natural’ optical activity, magnetic optical activity is generated by breaking time reversal symmetry. Therefore, molecular chirality is not expected to influence magnetic optical phenomena, such as Faraday rotation. Here we show that the chiral supramolecular assembly of polymers can result in large Faraday effects (Verdet constants = 105 °T–1m–1). This strong Faraday rotation, which is amongst the highest value known for organic materials, originates from the so-called Faraday B term. Typically, B term Faraday responses are weak. We demonstrate large amplification through excitonic coupling within the supramolecular assembly, where the chirality of the system controls the assembly formed. These observations provide an alternative means to enhance the Faraday rotation of low symmetry systems and clarify the role of chirality in previous reported materials.

Date: 2025
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DOI: 10.1038/s41467-025-64663-w

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