SCHEDULED MAINTENANCE
Highly contorted superhelicene hits near-infrared circularly polarized luminescence†
a
Juan M.
Cuerva,
a
Ermelinda
Maçôas,
*b
Carlos M.
Cruz
*ac
and
Araceli G.
Campaña
*a
Abstract
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, |glum| = 3.0 × 10−3) combined with good photoluminescence quantum yields (ϕF = 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.
- This article is part of the themed collections: Most popular 2022 organic chemistry articles, 2022 ChemSci Pick of the Week Collection and 2022 Chemical Science HOT Article Collection
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