期刊
ORGANIC & BIOMOLECULAR CHEMISTRY
卷 9, 期 10, 页码 3844-3853出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0ob00910e
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资金
- NSFC [20972024, 21073028]
- Fundamental Research Funds for the Central Universities [DUT10ZD212]
- Ministry of Education [SRFDP-200801410004, NCET-08-0077]
- Royal Society (UK)
- NSFC (China-UK Cost-Share Science Networks) [21011130154]
- State Key Laboratory of Fine Chemicals [KF0802]
- State Key Laboratory of Chemo/Biosensing and Chemometrics [2008009]
- Education Department of Liaoning Province [2009T015]
- Dalian University of Technology
Two highly selective OFF-ON green emitting fluorescent thiol probes (1 and 2) with intense absorption in the visible spectrum (molar extinction coefficient e is up to 73 800 M(-1) cm(-1) at 509 nm) based on dyads of BODIPY (as electron donor of the photo-induced electron transfer, i.e. PET) and 2,4-dinitrobenzenesulfonyl (DNBS) (as electron acceptor of the PET process) were devised. The single crystal structures of the two probes were determined. The distance between the electron donor (BODIPY fluorophore) and the electron acceptor (DNBS) of probe 2 is larger than that of probe 1, as a result the contrast ratio (or the PET efficiency) of probe 2 is smaller than that of probe 1. However, fluorescence OFF-ON switching effects were observed for both probe 1 and probe 2 in the presence of cysteine (the emission enhancement is 300-fold for probe 1 and 54-fold for probe 2). The fluorescence OFF-ON sensing mechanism is rationalized by DFT/TDDFT calculations. We demonstrated with DFT calculations that DNBS is ca. 0.76 eV more potent to accept electrons than the maleimide moiety. The probes were used for fluorescent imaging of cellular thiols.
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