Novel Dibenzofulvene‐Based NIR‐II Emission Phototheranostic Agent with an 82.6% Photothermal Conversion Efficiency for Photothermal Therapy

Organic molecules with second near‐infrared (NIR‐II, 1000–1700 nm) emission have significant advantages over NIR‐I (600–900 nm) dyes, and have been widely used as phototheranostic agents (PTAs) and fluorescent probes. However, the two biggest challenges for such reagents are improving photothermal c...

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Bibliographic Details
Published in:Advanced functional materials 2024-02, Vol.34 (8), p.n/a
Main Authors: Liu, Yan‐Zhao, Ran, Xiao‐Yun, Zhou, Ding‐Heng, Zhang, Hong, Chen, Yu‐Jin, Xu, Ji‐Xuan, Chen, Shan‐Yong, Kong, Qing‐Quan, Yu, Xiao‐Qi, Li, Kun
Format: Article
Language:English
Subjects:
Charge transfer
Conjugation
diphenylfullerene
Emission
Fluorescent indicators
Low molecular weights
Nanoparticles
Near infrared radiation
NIR‐II emission
Organic chemistry
phototheranostic agent
Photothermal conversion
photothermal conversion efficiency
photothermal therapy
Reagents
Therapy
Vibrators
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Summary:Organic molecules with second near‐infrared (NIR‐II, 1000–1700 nm) emission have significant advantages over NIR‐I (600–900 nm) dyes, and have been widely used as phototheranostic agents (PTAs) and fluorescent probes. However, the two biggest challenges for such reagents are improving photothermal conversion efficiency (PCE), and simplifying tedious synthetic procedures. Herein, different from the traditional NIR skeleton, for the first time, it develops two novel dibenzofulvene‐based NIR‐II emission PTAs via D‐π‐A concept with high PCEs through two simple synthetic steps. The increased intramolecular charge transfer effect and extended π‐conjugation effectively red‐shift their emissions to the NIR‐II region. In addition, the introduction of molecular rotors/vibrators and the formation of π–π stacking prompt the two PTAs to exhibit high PCEs. Notably, FE‐IDMN nanoparticles (FE‐IDMN NPs) achieve an exciting PCE of 82.6%, higher than most reported photothermal agents with NIR‐II emission. FE‐IDMN NPs also possess good colloidal, pH, and photothermal stabilities, as well as excellent photoacoustic response, which is further successfully applied for NIR‐II fluorescence/photoacoustic/photothermal imaging‐guided photothermal therapy. This work provides a simple strategy for constructing new D‐π‐A PTAs with low molecular weight, NIR‐II emission, and high PCE for cancer therapy. A novel low‐molecular‐weight dibenzofulvene‐based D‐π‐A phototheranostic agent (PTA) with NIR‐II emission and high PCE is developed by the strategies of enhancing D‐A strength, introducing molecular rotors/vibrators, and facilitating intermolecular π–π stacking. The PTA is successfully applied in the multi‐modal imaging (NIR‐II fluorescence/photoacoustic/photothermal imaging)‐guided photothermal therapy.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202311365