Tubular All-Benzene Nanocarbon with Evolving Excited-State Chirality.

IF 16.9 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Angewandte Chemie International Edition Pub Date : 2025-10-03 DOI:10.1002/anie.202518587

Gaolei Li,Xueli Wang,Liang-Liang Mao,Jia-Nan Gao,Xueliang Shi,Hongwei Li,Zi-Tong Li,Zi-Ye Huo,Yiming Chen,Hai-Bo Yang,Jinquan Chen,Chen-Ho Tung,Li-Zhu Wu,Huan Cong

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Abstract

Molecular nanocarbons with precisely defined conjugated scaffolds can provide an ideal platform for investigating mechanistic insights into photophysical properties. Here, we report the synthesis and time-resolved spectroscopic characterization of two isomeric tubular all-benzene nanocarbon (TANC) molecules, named meso- and chiral-TANC, respectively. Structurally, they feature triple covalent linkages, with different connectivity, between coaxially stacked cycloparaphenylene units. While meso-TANC maintains conformational rigidity, chiral-TANC shows photo-induced dynamic helicity. Femtosecond transient absorption (TA) and time-resolved circularly polarized luminescence (TRCPL) spectroscopy demonstrate that chiral-TANC undergoes ultrafast relaxation accompanied by untwisting motions within 8 ps upon photoexcitation, establishing the direct correlation between photo-induced conformational evolution and chiroptical dynamics in heteroatom-free, fully conjugated molecules.

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具有演化激发态手性的管状全苯纳米碳。

具有精确定义的共轭支架的分子纳米碳可以为研究光物理性质的机制见解提供理想的平台。在这里，我们报道了两种异构体管状全苯纳米碳（TANC）分子的合成和时间分辨光谱表征，分别命名为介观-和手性-TANC。在结构上，它们具有三个共价键，具有不同的连通性，在同轴堆叠的环对苯炔单元之间。虽然中位- tanc保持构象刚性，但手性- tanc表现出光诱导的动态螺旋。飞秒瞬态吸收（TA）和时间分辨圆偏振发光（TRCPL）光谱表明，手性- tanc在光激发下发生超快弛豫，并在8 ps内进行解扭运动，从而在无杂原子的全共轭分子中建立了光诱导构象演化与chiroptic动力学之间的直接关联。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Angewandte Chemie International Edition 化学-化学综合

CiteScore

26.60

自引率

6.60%

发文量

3549

审稿时长

1.5 months

期刊介绍： Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.