Panchromatic light-harvesting antenna by supramolecular exciton band engineering for heteromeric dye foldamer

被引:2
|
作者
Schulz, Alexander [1 ]
Froehlich, Rebecca [2 ]
Jayachandran, Ajay [2 ]
Schneider, Franziska [1 ]
Stolte, Matthias [1 ,3 ]
Brixner, Tobias [2 ,3 ]
Wuerthner, Frank [1 ,3 ]
机构
[1] Univ Wurzburg, Inst Organ Chem, D-97074 Hubland, Germany
[2] Univ Wurzburg, Inst Phys & Theoret Chem, D-97074 Wurzburg, Germany
[3] Univ Wurzburg, Ctr Nanosyst Chem CNC, Theodor Boveri Weg, D-97074 Wurzburg, Germany
来源
CHEM | 2024年 / 10卷 / 09期
关键词
FLUORESCENCE QUANTUM YIELDS; MEROCYANINE DYES; ENERGY; COUPLINGS; DIMERS;
D O I
10.1016/j.chempr.2024.05.023
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Natural photosystems accomplish panchromatic light absorption by different chromophores that are non-covalently embedded in protein matrices and mostly lack close dye-dye interactions. In this article, we introduce a light-harvesting (LH) system established by four different merocyanine dyes that are co-facially stacked by dipole-dipole interactions and a peptide-like backbone in a folded heteromer architecture to afford a panchromatic absorption band consisting of several strongly coupled exciton states. This exciton manifold allows for ultrafast and efficient energy transport in the artificial antenna. Furthermore, due to the tight stacking of the dyes in their folded state, non-radiative processes are slowed down, thereby increasing the lifetime of the excited state and the fluorescence quantum yield from <3% for the individual dyes up to 38% for the folda-heteromer. Together with the panchromatic absorption, this leads to a substantial improvement of the fluorescence brightness upon broadband excitation in comparison with its constituent chromophores.
引用
收藏
页数:15
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