Cited by 91Luminescence and Fluorescent MaterialsMolecular Sensors and Ion DetectionPhotochemistry and Electron Transfer Studies

Furan‐modified thiadiazolo quinoxaline as an electron acceptor for constructing second near‐infrared aggregation‐induced emission fluorophores for beyond 1300 nm fluorescence/photoacoustic imaging and photothermal therapy

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Liang, Mengke, Liu, Luyu, Sun, Ying, Li, Jia, Zhang, Ling'e, Jiang, Xiqun, Wu, Wei·2024·Aggregate

Abstract

Creation of new fluorophores is important for understanding the structure–property relationship, by which the required optical properties are likely to be attained. Herein, through theory calculation, it is found that furan‐modified thiadiazolo quinoxaline acting as an electron acceptor can endow donor–acceptor–donor (D–A–D) type second near‐infrared (NIR‐II) fluorophores with longer emission wavelength than the other thiadiazolo quinoxaline‐based acceptors containing pyridine, pyrrole, thiophene, and phenyl groups, respectively. On the basis of this theoretical prediction, a D–A–D type NIR‐II fluorophore with 6,7‐di(furan‐2‐yl)‐[1,2,5]thiadiazolo[3,4‐g] quinoxaline (DFTQ) as the acceptor and dithieno[3,2‐b:2′,3′‐d]pyrrole (DTP) as the donor is designed and synthesized, and the aggregation‐induced emission (AIE) function is further achieved by introducing the AIE units of tetraphenylethylene (TPE) and triphenylamine (TPA), respectively, totally forming three NIR‐II fluorophores DFTQ–DTP, DFTQ–DTPE, and DFTQ–DTPA. For biological applications, the fluorophores are encapsulated by amphiphilic DSPE–PEG 2000 to generate water‐dispersible nanoparticles (NPs). Almost the whole emission of each of the NPs falls into the NIR‐II spectral range, with part emission beyond 1300 nm. By using DFTQ–DTPA NPs as the contrast and photothermal therapy (PTT) agent, high‐resolution in vivo fluorescence imaging is achieved in the greater than 1300 nm window, and their good performance in photoacoustic imaging and high tumor PTT efficacy in tumor‐bearing mice are also demonstrated. Taken together, this work mainly provides a strong electron acceptor for constructing long‐emitting fluorophores, and by using the electron acceptor, a AIE fluorophore with desirable quantum yield (QY) and photothermal conversion efficienciy (PCE) is synthesized and demonstrated to be promising in fluorescence/photoacoustic imaging and PTT.

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Crossref · 10.1002/agt2.458

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  • The hydrophobic DFTQ-DTP fluorophore was encapsulated with the amphiphilic polymer DSPE-PEG2000 to form water-dispersible nanoparticles.

    “The hydrophobic DFTQ-DTP fluorophore was encapsulated with the amphiphilic polymer DSPE-PEG2000 to form water-dispersible nanoparticles.”
  • The resulting DFTQ-DTP nanoparticles exhibited exceptional NIR-II fluorescence, with an emission spectrum predominantly in the NIR-II region and a significant extension into the >1300 nm sub-window.

    “The resulting NPs exhibited exceptional NIR-II fluorescence, with an emission spectrum predominantly in the NIR-II region and a significant extension into the >1300 nm sub-window.”
  • Wu et al. designed a novel NIR-II fluorophore with a donor-acceptor-donor architecture employing dithieno[3,2-b:2',3'-d]pyrrole as the donor and 6,7-di(furan-2-yl)-[1,2,5]thiadiazolo[3,4-g]quinoxaline as the acceptor.

    “Wu et al. designed a novel NIR-II fluorophore with a D-A-D architecture, employing the strong electron-donating unit dithieno[3,2-b:2’,3’-d]pyrrole (DTP) as the donor and 6,7-di(furan-2-yl)-[1,2,5]thiadiazolo[3,4-g]quinoxaline (DFTQ) as the acceptor (Fig. 6b)131.”

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Authors
Liang, M., Liu, L., Sun, Y., Li, J., Zhang, L., Jiang, X., & Wu, W.
Affiliations
State Key Laboratory of Analytical Chemistry for Life Science (CN)
Corresponding author
  • Zhang, Ling'e
  • Jiang, Xiqun
  • Wu, Wei
Venue
Aggregate
Publisher
Wiley
Published
2023-11-06
Volume
5
Issue
2
ISSN
2692-4560 (ISSN-L)
OpenAlex
W4388459750
Cited by
90
References
50
Citations by year
2026: 24 · 2025: 46 · 2024: 20
FWCI
6.63
Type
journal article
Language
en
Open access
Locations
  • Aggregate (publishedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Natural Science Foundation of China (52373140 52173129 51973092, 52103157)
  • China Postdoctoral Science Foundation (2022M711544, 2023T160301)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Luminescence and Fluorescent Materials
  • Physical Sciences › Chemistry › Spectroscopy › Molecular Sensors and Ion Detection
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
Keywords
NIR-II fluorophores, aggregation-induced emission, photoacoustic imaging, photothermal therapy, tetraphenylethylene, triphenylamine, amphiphilic nanoparticles, tumor imaging

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