Water-miscible organic J-aggregate nanoparticles as efficient two-photon fluorescent nano-probes for bio-imaging
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Many two-photon absorption (TPA) organic dyes are water insoluble and suffer from strong fluorescence quenching in aqueous media due to the self-aggregation effect. This seriously limits their applications as two-photon fluorescence (TPF) probes in bio-imaging. By employing a reprecipitation method, we prepared ultrabright water-miscible organic nanoparticles (ONPs) of 1,4-dimethoxy-2,5-di[4′-(cyano)styryl]benzene (COPV). The single-crystal structure reveals that the cooperation between π–π stacking and hydrogen-bonding interactions drives COPV molecules into a brickwork arrangement of J-aggregates, in which the coherent excitation delocalization reaches 2–3 molecules. Due to the superradiance of J-aggregates, COPV ONPs are highly emissive in aqueous media with a quantum yield >0.4; meanwhile, their TPA cross-section is greatly enhanced, probably due to exciton–vibration coupling. As TPF probes, COPV J-aggregate ONPs are 3–4 orders of magnitude brighter than conventional fluorescent dyes and an order of magnitude brighter than quantum dots. Moreover, these ONPs exhibit no obvious cytotoxicity at concentrations as high as 100 μg mL−1. Our results demonstrate that ultrabright J-aggregate ONPs of COPV provide a new strategy to construct efficient TPF nano-probes for bio-imaging.
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Some non-polymethine J-aggregates stably exist in an aqueous environment.
“Some non-polymethine J-aggregates stably exist in an aqueous environment.109,110”
From The Pursuit of Shortwave Infrared-Emitting Nanoparticles with Bright Fluorescence through Molecular Design and Excited-State Engineering of Molecular Aggregates (2022) · cites this paper as [110]
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- Authors
- Xu, Z., Liao, Q., Wu, Y., Ren, W., Li, W., Liu, L., Wang, S., Gu, Z., Zhang, H., & Fu, H.
- Affiliations
- Chinese Academy of Sciences (CN)
- Corresponding author
- Gu, Zhanjun
- Fu, Hongbing
- Venue
- Journal of Materials Chemistry
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2012
- Volume
- 22
- Issue
- 34
- Pages
- 17737
- ISSN
- 0959-9428 (ISSN-L)
- 1364-5501
- OpenAlex
- W2078348642
- Cited by
- 56
- References
- 32
- Citations by year
- 2025: 2 · 2024: 1 · 2022: 2 · 2021: 6 · 2020: 2 · 2019: 4 · 2018: 7 · 2017: 7 · 2016: 4 · 2015: 13 · 2014: 3 · 2013: 5
- FWCI
- 3.09
- Type
- journal article
- Language
- en
- Open access
- green
- 202.201.7.4:8080
- Licence
- cc-by-nc-nd
- Locations
- Journal of Materials Chemistry (publishedVersion)
- Lanzhou University Institutional Repository (submittedVersion, cc-by-nc-nd)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Luminescence and Fluorescent Materials
- Physical Sciences › Engineering › Biomedical Engineering › Nonlinear Optical Materials Studies
- Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
- Keywords
- J-aggregates, two-photon absorption, bioimaging, π-π stacking, hydrogen bonding, superradiance, exciton-vibration coupling, cytotoxicity
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