Mapping the broadband circular dichroism of copolymer films with supramolecular chirality in time and space

Marius Morgenroth, Mirko Scholz, Min Ju Cho, Dong Hoon Choi, Kawon Oum () and Thomas Lenzer ()
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Marius Morgenroth: University of Siegen
Mirko Scholz: University of Siegen
Min Ju Cho: Korea University
Dong Hoon Choi: Korea University
Kawon Oum: University of Siegen
Thomas Lenzer: University of Siegen

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Measurements of the electronic circular dichroism (CD) are highly sensitive to the absolute configuration and conformation of chiral molecules and supramolecular assemblies and have therefore found widespread application in the chemical and biological sciences. Here, we demonstrate an approach to simultaneously follow changes in the CD and absorption response of photoexcited systems over the ultraviolet−visible spectral range with 100 fs time resolution. We apply the concept to chiral polyfluorene copolymer thin films and track their electronic relaxation in detail. The transient CD signal stems from the supramolecular response of the system and provides information regarding the recovery of the electronic ground state. This allows for a quantification of singlet−singlet annihilation and charge-pair formation processes. Spatial mapping of chiral domains on femtosecond time scales with a resolution of 50 μm and diffraction-limited steady-state imaging of the circular dichroism and the circularly polarised luminescence (CPL) of the films is demonstrated.

Date: 2022
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DOI: 10.1038/s41467-021-27886-1

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