Highly contorted superhelicene hits near-infrared circularly polarized luminescence
Metadatos
Mostrar el registro completo del ítemEditorial
Royal Society of Chemistry
Fecha
2022-07-19Referencia bibliográfica
Chem. Sci., 2022,13, 10267-10272. DOI: [10.1039/d2sc03452b]
Patrocinador
European Research Council (ERC) 677023; MCIN/AEI FEDER "Una manera de hacer Europa" PGC2018-101181-B-I00; Spanish Government BES-2016-076371; Fundacao para a Ciencia e a Tecnologiags UIDB/00100/2020 LA/P/0056/2020 PTDC/NAN-MAT/29317/2017 2020.01763.CEECINDResumen
Herein we describe a novel superhelicene structure consisting of three hexa-peri-hexabenzocoronene
(HBC) units arranged in a helical geometry and creating two carbo[5]helicenes and a carbo[7]helicene.
The central HBC bears a tropone moiety, which induces a saddle-helix hybrid geometry into the 3D
structure of the prepared nanographene. The introduction of multiple helicenes and the position of the
tropone unit trigger near-infrared circularly polarized luminescence (NIR-CPL, up to 850 nm, jglumj ¼ 3.0
10 3) combined with good photoluminescence quantum yields (fF ¼ 0.43) and upconverted emission
based on two-photon absorption (TPA). Compared to previously reported superhelicenes of similar size,
higher quantum yields, CPL brightness, and red-shifted absorption and emission spectra are achieved.
Besides, chiroptical properties of enantiopure thin films were evaluated. These findings place this novel
superhelicene as the first NIR-CPL superhelicene ever reported and make it a promising candidate for
use as a chiral luminescent material in optoelectronic devices.