Water-Soluble Off-On Spin-Labeled Quantum-Dots Conjugate

Engineering quantum dots (QDs) with a paramagnetic nitroxide radical tail yields a weakly fluorescent spin‐labeled QD conjugate. Quenching of the intrinsic fluorescence of the QDs results from electron transfer between the QDs and nitroxide radical. Interestingly, when the paramagnetic properties of...

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Bibliographic Details
Published inSmall (Weinheim an der Bergstrasse, Germany) Vol. 4; no. 6; pp. 759 - 764
Main Authors Chen, Wenbin, Wang, Xin, Tu, Xijuan, Pei, Dejun, Zhao, Yue, Guo, Xiangqun
Format Journal Article
LanguageEnglish
Published Weinheim WILEY-VCH Verlag 01.06.2008
WILEY‐VCH Verlag
Subjects
electron transfer
Fluorescent Dyes
fluorescent probes
luminescence
Quantum Dots
self-assembly
Solubility
Water - chemistry
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Summary:Engineering quantum dots (QDs) with a paramagnetic nitroxide radical tail yields a weakly fluorescent spin‐labeled QD conjugate. Quenching of the intrinsic fluorescence of the QDs results from electron transfer between the QDs and nitroxide radical. Interestingly, when the paramagnetic properties of the nitroxide moiety are eliminated, the quenched fluorescence of QDs is readily restored, making the spin‐labeled QDs sensitive to a biological antioxidant, vitamin C (Vc; see figure).
Bibliography:ark:/67375/WNG-Q1M8ZK1W-1
ArticleID:SMLL200700788
istex:65D974E6E08D0C8555BCEDA3264B2E258377DF40
This work was supported by the National Natural Science Foundation of China (20375032, 20675068).
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ISSN:1613-6810
1613-6829
DOI:10.1002/smll.200700788