Issue 35, 2022

Highly contorted superhelicene hits near-infrared circularly polarized luminescence

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.

Graphical abstract: Highly contorted superhelicene hits near-infrared circularly polarized luminescence

Supplementary files

Article information

Article type
Edge Article
Submitted
20 6 2022
Accepted
19 7 2022
First published
19 7 2022
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2022,13, 10267-10272

Highly contorted superhelicene hits near-infrared circularly polarized luminescence

S. Míguez-Lago, I. F. A. Mariz, M. A. Medel, J. M. Cuerva, E. Maçôas, C. M. Cruz and A. G. Campaña, Chem. Sci., 2022, 13, 10267 DOI: 10.1039/D2SC03452B

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