Small Molecule NIR-II Dyes for Switchable Photoluminescence via Host -Guest Complexation and Supramolecular Assembly with Carbon Dots.
Small Molecule NIR-II Dyes for Switchable Photoluminescence via Host -Guest Complexation and Supramolecular Assembly with Carbon Dots.
复制标题
通过主客体络合和超分子碳点组装实现光致发光的小分子近红外-II染料。
DOI:
10.1002/advs.202202414
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发表时间:
2022-08
期刊:
影响因子:
15.1
通讯作者:
Pan, Dipanjan
中科院分区:
文献类型:
--
作者:
Sar, Dinabandhu;Ostadhossein, Fatemeh;Moitra, Parikshit;Alafeef, Maha;Pan, Dipanjan
关键词:
Small molecular NIR‐II dyes are highly desirable for various biomedical applications. However, NIR‐II probes are still limited due to the complex synthetic processes and inadequate availability of fluorescent core. Herein, the design and synthesis of three small molecular NIR‐II dyes are reported. These dyes can be excited at 850–915 nm and emitted at 1280–1290 nm with a large stokes shift (≈375 nm). Experimental and computational results indicate a 2:1 preferable host–guest assembly between the cucurbit[8]uril (CB) and dye molecules. Interestingly, the dyes when self‐assembled in presence of CB leads to the formation of nanocubes (≈200 nm) and exhibits marked enhancement in fluorescence emission intensity (Switch‐On). However, the addition of red carbon dots (rCDots, ≈10 nm) quenches the fluorescence of these host–guest complexes (Switch‐Off) providing flexibility in the user‐defined tuning of photoluminescence. The turn‐ON complex found to have comparable quantum yield to the commercially available near‐infrared fluorophore, IR‐26. The aqueous dispersibility, cellular and blood compatibility, and NIR‐II bioimaging capability of the inclusion complexes is also explored. Thus, a switchable fluorescence behavior, driven by host–guest complexation and supramolecular self‐assembly, is demonstrated here for three new NIR‐II dyes. Three small molecular NIR‐II dyes are employed those exhibit marked enhancement in emission intensity (Switch‐On) when self‐assembled in presence of cucurbit[8]uril. Further addition of red carbon dots to the nanocubes leads to the queching of fluorescence of these host–guest complexes (Switch‐Off) providing flexibility in the user‐defined tuning of photoluminescence.
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