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, |g _lum| = 3.0 × 10^-3) combined with good photoluminescence quantum yields (ϕ _F = 0.43) and upconverted emission based on two-photon absorption (TPA). Compared to previously reported superhelicenes of similar size, higher quantum yields, CPL brightness,

SUBMITTER: Miguez-Lago S 

PROVIDER: S-EPMC9473535 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature