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Tubular All-Benzene Nanocarbon with Evolving Excited-State Chirality
Gaolei Li1, Xueli Wang2, Liang-Liang Mao1
1Key Laboratory of Photochemical Conversion and Optoelectronic Materials, CAS-HKU Joint Laboratory on New Materials, Technical Institute of Physics and Chemistry, School of Future Technology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China.
None:
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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