Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 42, Pages 47208-47219Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c11701
Keywords
BODIPY oligomers; boron dipyrromethene; phototheranostic agents; NIR absorption; excited-state intramolecular rotation
Funding
- National Natural Science Foundation of China [21672006, 21672007, 21875063]
- Shanghai Natural Science Foundation [18ZR1408300]
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Conjugated molecules with coplanar strong donor and acceptor (D-A) units have been widely used in the design of near-infrared (NIR) photothermal agents to increase an absorption band through intramolecular charge transfer and to control intramolecular motions in aggregated states. However, such conjugated D-A systems have strong dipolar moments and intermolecular interactions, which may inhibit other channels of photothermal conversion and are often susceptible to nucleophiles, especially in the presence of light irradiation. Now, we report a molecular guideline to develop novel NIR organic photothermal nanoagents based on conjugated boron dipyrromethene (BODIPY) oligomers. This oligomerization is helpful not only for their tunable NIR absorptions in the ground state with distinctly redshifted absorption maxima up to 1002 nm and high extinction coefficients but also for their highly efficient photothermal conversion because of the possible motion of the BODIPY motifs around the ethene linked group in the excited state. These oligomers were fabricated as ultra-photostable nanoagents for multiple imaging-guided phototherapies, which efficiently accumulated in tumors, and gave complete tumor ablation with NIR laser irradiation. This strategy of ground-state conjugation, excited-state rotation provides a novel guideline to develop advanced theranostic molecules with NIR absorption.
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