A Chiral Propeller-Shaped Triple Helicene Shows Multi-Resonant Thermally Activated Delayed Fluorescence

被引：0

作者：

Wang, Jingxiang ^{[1
]}

Oviedo Ortiz, Jhon Sebastian ^{[2
]}

McKay, Aidan P. ^{[1
]}

Cordes, David B. ^{[1
]}

Crassous, Jeanne ^{[2
]}

Zysman-Colman, Eli ^{[1
]}

机构：

[1] Univ St Andrews, Organ Semicond Ctr, EaStCHEM Sch Chem, St Andrews KY16 9ST, Fife, Scotland

[2] Univ Rennes, CNRS, ISCR Inst Sci Chim Rennes, UMR 6226, F-35000 Rennes, France

来源：

HELVETICA CHIMICA ACTA | 2024年 / 107卷 / 11期

基金：

英国工程与自然科学研究理事会;

关键词：

Chirality; helicene; circular dichroism; circularly polarized luminescence; multi-resonant thermally activated delayed fluorescence; QUANTUM EFFICIENCIES; EXCITED-STATES; DENSITY; SOLVENT;

D O I：

10.1002/hlca.202400129

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Multi-resonant thermally activated delayed fluorescence (MR-TADF) helicenes show great potential as chiral emitters due to their typically high photoluminescence quantum yield and that they emit circularly polarized luminescence. Here, a new propeller-shaped chiral MR-TADF helicene DiKTa3, integrating three DiKTa moieties, was designed and synthesized aiming to achieve co-parallel electronic and magnitude transition dipole moments that would lead to a high dissymmetry factor, g. It emits at lambda PL of 491 nm, with a full width at half maximum of 52 nm and has a moderate Delta EST value of 0.24 eV in toluene. The separated (P,P,P) enantiomer shows an absorption dissymmetry factor |gabs| of 6.8x10-4 at 450 nm, which results from a lower symmetry conformation adopted by the compound in solution than the C3-symmetric optimized structure. This work highlights the strong influence that geometry can have on the chiroptical properties of the emitter.

引用

页数：11