Volume 61, Issue 44 e202211081
Research Article

Unique Double Intramolecular and Intermolecular Exciton Coupling in Ethene-Bridged aza-BODIPY Dimers for High-Efficiency Near-Infrared Photothermal Conversion and Therapy

Xing Guo

Xing Guo

Laboratory of Functionalized Molecular Solids, Ministry of Education Institution, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002 China

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Jinming Yang

Jinming Yang

School of Pharmacy, Anhui University of Chinese Medicine, Hefei, 230012 China

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Mao Li

Mao Li

Laboratory of Functionalized Molecular Solids, Ministry of Education Institution, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002 China

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Fan Zhang

Fan Zhang

Laboratory of Functionalized Molecular Solids, Ministry of Education Institution, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002 China

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Weibin Bu

Weibin Bu

Laboratory of Functionalized Molecular Solids, Ministry of Education Institution, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002 China

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Heng Li

Heng Li

Laboratory of Functionalized Molecular Solids, Ministry of Education Institution, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002 China

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Dr. Qinghua Wu

Corresponding Author

Dr. Qinghua Wu

School of Pharmacy, Anhui University of Chinese Medicine, Hefei, 230012 China

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Prof. Dengke Yin

Corresponding Author

Prof. Dengke Yin

School of Pharmacy, Anhui University of Chinese Medicine, Hefei, 230012 China

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Prof. Lijuan Jiao

Corresponding Author

Prof. Lijuan Jiao

Laboratory of Functionalized Molecular Solids, Ministry of Education Institution, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002 China

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Prof. Erhong Hao

Corresponding Author

Prof. Erhong Hao

Laboratory of Functionalized Molecular Solids, Ministry of Education Institution, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002 China

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First published: 13 September 2022
Citations: 71

Graphical Abstract

An aza-BODIPY dimer exhibits unique double intra- and intermolecular exciton couplings, resulting in a dramatic red-shift of the absorption to the second near-infrared (NIR-II) region. Its self-assembled nanoparticles have high photothermal conversion ability and are ultra-photostable, which can efficiently lead to complete tumor ablation under 915 nm laser irradiation with ultralow power density.

Abstract

Spatial electronic communications of chromophores are both theoretically and practically fascinating. Despite intramolecular or intermolecular exciton coupling was observed in multichromophoric oligomers and J-aggregates, respectively, it is unusual that they both occur in the same molecule. Herein, ethene-bridged aza-BODIPY dimers with intramolecular exciton splitting have been developed. By encapsulating the dimer into F-127 polymer, J-type aggregated nanoparticles were produced, which showed obvious intermolecular exciton coupling and dramatically redshifted absorption and emission peaks at 936 and 1003 nm, respectively. The fabricated nanoagents have high photothermal conversion ability (η=60.3 %) and are ultra-photostable, leading to complete tumor ablation with 915 nm laser irradiation. This phototherapeutic nanoplatform through modulating both intra- and intermolecular exciton couplings is a valuable paradigm for developing photothermal agents for tumor treatment.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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