Tubular All‐Benzene Nanocarbon with Evolving Excited‐State Chirality
Abstract
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.
Article Details
Authors (14)
Gaolei Li
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , , ,
Xueli Wang
State Key Laboratory of Precision Spectroscopy
Liang‐Liang Mao
Key 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
Jia‐Nan Gao
Key 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
Xueliang Shi
East China Normal University , , ,
Hongwei Li
Peking University , , ,
Zi‐Tong Li
Key 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
Zi‐Ye Huo
Key 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
Yiming Chen
Hai‐Bo Yang
School of Chemistry and Molecular Engineering East China Normal University Shanghai China
Jinquan Chen
State Key Laboratory of Precision Spectroscopy
Chen‐Ho Tung
School of Chemistry and Chemical Engineering Shandong University Jinan China
Li‐Zhu Wu
Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing China
Huan Cong
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , , ,