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Ultralarge Stokes Shift Phosphorescence Artificial Harvesting Supramolecular System with Near‐Infrared Emission
A two‐step sequential phosphorescence harvesting system with ultralarge Stokes shift and near‐infrared (NIR) emission at 825 nm is successfully constructed by racemic 1,2‐diaminocyclohexan‐derived 6‐bromoisoquinoline (BQ), cucurbit[8]uril (CB[8]), and amphipathic sulfonatocalix[4]arene (SC4AD) via cascaded assembly strategy in aqueous solution. In virtue of the confinement effect of CB[8] with rigid cavity, BQ can generate an emerging phosphorescent emission at 555 nm. Subsequently, the binary BQ⊂CB[8] further assemblies with SC4AD to form close‐packed spherical aggregate, which contributes to the dramatic enhancement of phosphorescence emission intensity ≈30 times with prolonged lifetime from 21.3 µs to 0.364 ms. Notably, the BQ⊂CB[8]@SC4AD assembly can serve as an energy donor to conduct stepwise phosphorescence harvesting process through successive introduction of primary acceptors, cyanine 5 (Cy5) or nile blue (NiB), and secondary acceptor, heptamethine cyanine (IR780). The final aggregate with remarkable ultralarge Stokes shift (≈525 nm) and long‐lived NIR photoluminescence (PL) emission at 825 nm is further employed as imaging agent for NIR cell labeling.
Ultralarge Stokes Shift Phosphorescence Artificial Harvesting Supramolecular System with Near‐Infrared Emission
A two‐step sequential phosphorescence harvesting system with ultralarge Stokes shift and near‐infrared (NIR) emission at 825 nm is successfully constructed by racemic 1,2‐diaminocyclohexan‐derived 6‐bromoisoquinoline (BQ), cucurbit[8]uril (CB[8]), and amphipathic sulfonatocalix[4]arene (SC4AD) via cascaded assembly strategy in aqueous solution. In virtue of the confinement effect of CB[8] with rigid cavity, BQ can generate an emerging phosphorescent emission at 555 nm. Subsequently, the binary BQ⊂CB[8] further assemblies with SC4AD to form close‐packed spherical aggregate, which contributes to the dramatic enhancement of phosphorescence emission intensity ≈30 times with prolonged lifetime from 21.3 µs to 0.364 ms. Notably, the BQ⊂CB[8]@SC4AD assembly can serve as an energy donor to conduct stepwise phosphorescence harvesting process through successive introduction of primary acceptors, cyanine 5 (Cy5) or nile blue (NiB), and secondary acceptor, heptamethine cyanine (IR780). The final aggregate with remarkable ultralarge Stokes shift (≈525 nm) and long‐lived NIR photoluminescence (PL) emission at 825 nm is further employed as imaging agent for NIR cell labeling.
Ultralarge Stokes Shift Phosphorescence Artificial Harvesting Supramolecular System with Near‐Infrared Emission
Huo, Man (Autor:in) / Dai, Xian‐Yin (Autor:in) / Liu, Yu (Autor:in)
Advanced Science ; 9
01.08.2022
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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