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Dokument Type: Article
metadata.dc.title: Mapping the broadband circular dichroism of copolymer films with supramolecular chirality in time and space
Authors: Morgenroth, Marius 
Scholz, Mirko 
Cho, Min Ju 
Choi, Dong Hoon 
Oum, Kawon 
Institute: Department Chemie - Biologie 
Free keywords: Copolymer films, Circular dichroism, Circularly polarised luminescence
Dewey Decimal Classification: 540 Chemie
GHBS-Clases: UUK
Issue Date: 2022
Publish Date: 2023
Source: Nature communications ; 13 (1), article number 210. -
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.
Finanziert im Rahmen der DEAL-Verträge durch die Universitätsbibliothek Siegen
URN: urn:nbn:de:hbz:467-24466
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