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Highly Photostable and Luminescent Donor–Acceptor Molecules for Ultrasensitive Detection of Sulfur Mustard
Advanced Science ( IF 15.1 ) Pub Date : 2021-01-04 , DOI: 10.1002/advs.202002615
Linfeng Cui 1 , Yanjun Gong 2 , Chuanqin Cheng 1 , Yongxian Guo 1 , Wei Xiong 1 , Hongwei Ji 1 , Lang Jiang 1 , Jincai Zhao 1 , Yanke Che 1
Affiliation  

Real‐time, high signal intensity, and prolonged detection is challenging because of the rarity of fluorophores with both high photostability and luminescence efficiency. In this work, new donor–acceptor (D–A) molecules for overcoming these limitations are reported. A hybridized local and an intramolecular charge‐transfer excited state is demonstrated to afford high photoluminescence efficiency of these D–A molecules in solution (≈100%). The twisted molecular structure and bulky alkyl chains effectively suppress ππ and dipole–dipole interactions, enabling high luminescence efficiency of 1 and 2 in the solid state (≈94% and 100%). Furthermore, two D–A aggregates exhibit high photostability as evidenced by 4% and 8% of the fluorescence decreasing after 6 h of continuous irradiation in air, which is in sharp contrast to ≈95% of fluorescence decreasing in a reference compound. Importantly, with these molecules, ultrasensitive detection of sulfur mustard (SM) with a record limit of 10 ppb and selective detection of SM in complex matrices are achieved.

中文翻译:

用于超灵敏检测硫芥的高度光稳定性和发光供体-受体分子

由于同时具有高光稳定性和发光效率的荧光团的稀有性,实时、高信号强度和长时间的检测具有挑战性。在这项工作中,报道了克服这些限制的新供体-受体(D-A)分子。杂化局部和分子内电荷转移激发态被证明可以为这些 D-A 分子在溶液中提供高光致发光效率(约 100%)。扭曲的分子结构和庞大的烷基链有效抑制了π - π和偶极-偶极相互作用,使12在固态下具有高发光效率(约94%和100%)。此外,两种 D-A 聚集体表现出高光稳定性,在空气中连续照射 6 小时后,荧光下降 4% 和 8%,这与参考化合物中约 95% 的荧光下降形成鲜明对比。重要的是,利用这些分子,可以对硫芥子气 (SM) 进行超灵敏检测,其限值达到创纪录的 10 ppb,并可选择性检测复杂基质中的 SM。
更新日期:2021-02-17
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