Straightforward Synthesis of Pentagon-Embedded Expanded [11]Helicenes for Radiative Cooling Property.
Chemistry
; 30(3): e202302893, 2024 Jan 11.
Article
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| MEDLINE
| ID: mdl-37867144
ABSTRACT
Two new pentagon-embedded carbo[11]helicenes have been designed and synthesized in a three-step process, which are the first example of carbo[11]helicenes through the post-functionalization of twistacene. TD-DFT analyses indicate that both of them possess high enantiomerization barriers of 42.29â
kcal/mol and 40.76â
kcal/mol, respectively. They emit strong red fluorescence and can be chemically oxidized into stable cationic radicals upon addition of AgSbF6 evidenced by the bathochromic-shifted absorption spectra and the appearance of electronic paramagnetic resonance (EPR) signals. In addition, such helical derivatives can be chosen as radiative cooling materials in a glass model house, and the maxima of 5.4 °C for the former and 6.5 °C for the latter are found in the comparative tests, which might be caused by the NIR reflective response.
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MEDLINE
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En
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Chemistry
Asunto de la revista:
QUIMICA
Año:
2024
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Article