23 September 2016 Helicity, assembly, and circularly polarised luminesence of chiral AIEgens
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Abstract
As opposed to most fluorophores that suffer from aggregation-caused quenching (ACQ), aggregation-induced emissive luminogens (AIEgens) possess very weak fluorescence in solution, but show strong emission upon aggregation due to restriction of intramolecular motion (RIM). Since AIEgens are often comprised of propeller-shaped structures, i.e. polyphenylsiloles or tetraphenylethylene (TPE), the attachment of chiral units has recently proven a powerful tool to fabricate chiral AIEgens exhibiting strong circularly-polarized luminescence (CPL) signal upon aggregation. Different chiral moieties lead to various assembled structures, such as helical nanoribbons, superhelical ropes, hollow and solid micro-/nanospheres. Generally, these structures exhibit enhanced chiroptical properties when compared to their monomeric counterpart. In this context, we report on the tetraphenylsilole and TPE derivatives with side-chains bearing an enantiomerically pure chiral units readily assembled into superhelical ropes upon aggregation, which displayed large CPL dissymmetry factors (gem) of –0.32 – a record for purely organic chiral materials.
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Hongkun Li, Hongkun Li, Bing Shi Li, Bing Shi Li, Ben Zhong Tang, Ben Zhong Tang, "Helicity, assembly, and circularly polarised luminesence of chiral AIEgens", Proc. SPIE 9940, Liquid Crystals XX, 99400A (23 September 2016); doi: 10.1117/12.2239994; https://doi.org/10.1117/12.2239994
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