The study of the chiroptical properties of thin-film samples of two chiral benzo[1,2-b:4,5-b']dithiophene-based oligothiophenes with optoelectronic properties was carried out at Diamond B23 beamline using the synchrotron radiation electronic circular dichroism imaging (SR-ECDi) facility. The experimental results support the hypothesis that the non-reciprocal circularly polarized absorption observed in these materials is due to the combined linear dichroism and linear birefringence contributions. The mapping at 50-mu m spatial resolution revealed that several species coexist in the mesoscopic chiral domains likely due to different aggregated phases, which were identified in the films by SR-ECDi but could not be detected with benchtop ECD instruments.

Spatially resolved chiroptical study of thin films of benzo[1,2-b:4,5-b']dithiophene-based oligothiophenes by synchrotron radiation electronic circular dichroism imaging (SR-ECDi) technique

Gianluigi Albano
Primo
;
Gennaro Pescitelli
Penultimo
;
Lorenzo Di Bari
Ultimo
2022-01-01

Abstract

The study of the chiroptical properties of thin-film samples of two chiral benzo[1,2-b:4,5-b']dithiophene-based oligothiophenes with optoelectronic properties was carried out at Diamond B23 beamline using the synchrotron radiation electronic circular dichroism imaging (SR-ECDi) facility. The experimental results support the hypothesis that the non-reciprocal circularly polarized absorption observed in these materials is due to the combined linear dichroism and linear birefringence contributions. The mapping at 50-mu m spatial resolution revealed that several species coexist in the mesoscopic chiral domains likely due to different aggregated phases, which were identified in the films by SR-ECDi but could not be detected with benchtop ECD instruments.
2022
Albano, Gianluigi; Górecki, Marcin; Jávorfi, Tamás; Hussain, Rohanah; Siligardi, Giuliano; Pescitelli, Gennaro; DI BARI, Lorenzo
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1156342
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