Carbonyl mediated fluorescence in aceno[n]helicenones and fluoreno[n]helicenes

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388963%3A_____%2F24%3A00586800" target="_blank" >RIV/61388963:_____/24:00586800 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1039/D4SC00892H" target="_blank" >https://doi.org/10.1039/D4SC00892H</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/d4sc00892h" target="_blank" >10.1039/d4sc00892h</a>

Result language
angličtina
Original language name
Carbonyl mediated fluorescence in aceno[n]helicenones and fluoreno[n]helicenes
Original language description
Helicenes are very attractive chiral non-planar polycyclic aromatic hydrocarbons possessing strong chiroptical properties. However, most of the helicenes absorb light mainly in the ultraviolet region, with only a small segment in the blue part of the visible spectrum. Furthermore, carbo[n]helicenes exhibit only weak luminescence that limits their utilization. Herein, we demonstrate that peripheral decoration of the helicene backbone with an aryl-carbonyl group shifts the absorption to the visible region and simultaneously improves their fluorescence quantum yields. We thus show that the carbonyl group, commonly considered as detrimental to emission, has the capability of improving optical and photophysical properties. Two different families, aceno[n]helicenones and fluoreno[n]helicenes, are presented with comprehensive spectrochemical characterization. TD-DFT calculations were implemented to clarify their electronic profiles. We show that increasing the helical length in aceno[n]helicenes increases absorption onset, g(abs) and g(lum). Extension of the peripheral aromatic part in fluoreno[n]helicenes leads to a blue shift in both absorption and emission.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10401 - Organic chemistry

Project
<a href="/en/project/GA20-23566S" target="_blank" >GA20-23566S: The synthesis and properties of polycyclic inherently chiral aromatics</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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