Understanding the AIE phenomenon of nonconjugated rhodamine derivatives via aggregation-induced molecular conformation change

Lin-Lin Yang, Haoran Wang, Jianyu Zhang, Bo Wu, Qiyao Li, Jie-Ying Chen, A-Ling Tang, Jacky W. Y. Lam, Zheng Zhao (), Song Yang () and Ben Zhong Tang ()
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Lin-Lin Yang: Guizhou University, Huaxi District
Haoran Wang: The Chinese University of Hong Kong, Shenzhen (CUHK-Shenzhen)
Jianyu Zhang: The Hong Kong University of Science and Technology
Bo Wu: The Chinese University of Hong Kong, Shenzhen (CUHK-Shenzhen)
Qiyao Li: The Chinese University of Hong Kong, Shenzhen (CUHK-Shenzhen)
Jie-Ying Chen: Guizhou University, Huaxi District
A-Ling Tang: Guizhou University, Huaxi District
Jacky W. Y. Lam: The Hong Kong University of Science and Technology
Zheng Zhao: The Chinese University of Hong Kong, Shenzhen (CUHK-Shenzhen)
Song Yang: Guizhou University, Huaxi District
Ben Zhong Tang: The Chinese University of Hong Kong, Shenzhen (CUHK-Shenzhen)

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract The bottom-up molecular science research paradigm has greatly propelled the advancement of materials science. However, some organic molecules can exhibit markedly different properties upon aggregation. Understanding the emergence of these properties and structure-property relationship has become a new research hotspot. In this work, by taking the unique closed-form rhodamines-based aggregation-induced emission (AIE) system as model compounds, we investigated their luminescent properties and the underlying mechanism deeply from a top-down viewpoint. Interestingly, the closed-form rhodamine-based AIE system did not display the expected emission behavior under high-viscosity or low-temperature conditions. Alternatively, we finally found that the molecular conformation change upon aggregation induced intramolecular charge transfer emission and played a significant role for the AIE phenomenon of these closed-form rhodamine derivatives. The application of these closed-form rhodamine-based AIE probe in food spoilage detection was also explored.

Date: 2024
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DOI: 10.1038/s41467-024-45271-6

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