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 synchro...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-μM 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.展开更多
The enantiomers of carboline-based cryptates were successfully resolved by chiral HPLC.These complexes show high configurational stability under harsh conditions and their absolute configuration was determined by comp...The enantiomers of carboline-based cryptates were successfully resolved by chiral HPLC.These complexes show high configurational stability under harsh conditions and their absolute configuration was determined by comparing theoretical and expe rimental electronic circular dichroism spectra.The e nantiopure cryptates exhibit strong circularly polarized luminescence with a maximum dissymmetry factor glum=0.25 for the f-f transition 5 D0→7 F1(λ=594 nm)under visible light excitation atλgx=400 nm.展开更多
文摘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-μM 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.
基金Project supported by the German Research Foundation(DFG,research grant SE1448/7-1 for M.S.)German Academic Scholarship Foundation(Studienstiftung des deutsches Volkes,predoctoral fellowship for E.K.)。
文摘The enantiomers of carboline-based cryptates were successfully resolved by chiral HPLC.These complexes show high configurational stability under harsh conditions and their absolute configuration was determined by comparing theoretical and expe rimental electronic circular dichroism spectra.The e nantiopure cryptates exhibit strong circularly polarized luminescence with a maximum dissymmetry factor glum=0.25 for the f-f transition 5 D0→7 F1(λ=594 nm)under visible light excitation atλgx=400 nm.
