Ring-Expansion Strategy for α-Aryl Azahelicene Construction: Building Blocks for Optoelectronic Materials
Jia Feng, Limin Wang, Xiaoping Xue, Zengyin Chao, Biqiong Hong, Zhenhua Gu
Abstract
An acid-mediated rapid synthesis of α-aryl azahelicenes via C–C bond cleavage of helical 9H-fluoren-9-ols is reported. The newly introduced aryl ring and pyridine moieties provide an excellent opportunity to further tune the properties of azahelicences: i.e., photoluminescence. The novel α-aryl azahelicenes showcase high circularly polarized luminescence (CPL) efficiencies (4.5 × 10–3) as well as CPL brightness (BCPL), reaching 7.39 M–1 cm–1, which indicates a potential application as chiral emitters.
Topics & Concepts
ArylChemistryPyridinePhotoluminescenceRing (chemistry)LuminescenceBrightnessCleavage (geology)Combinatorial chemistryPhotochemistryStereochemistryOptoelectronicsOrganic chemistryMaterials scienceOpticsPhysicsComposite materialFracture (geology)AlkylSynthesis and Properties of Aromatic CompoundsLuminescence and Fluorescent MaterialsOrganoboron and organosilicon chemistry