Optical highlighters are photoactivatable fluorescent molecules that exhibit pronounced changes in their spectral properties in response to irradiation with light of a specific wavelength and intensity. Here, we present a novel design strategy for a new class of caged BODIPY (4,4-difluoro-4-bora-3a,4a-diaza-s-indacene) fluorophores, based on the use of photoremovable protecting groups (PRPGs) with
Rationally Designed Fluorescent pH Sensors for Measurements in Extremely Alkaline Media
作者:Nurcan Tuncer、Efdal Teknikel、Canan Unaleroglu
DOI:10.1007/s10895-018-2310-8
日期:2018.11
meso-phenol BODIPY to achieve fluorescent pH sensors working in extreme alkalinity. We demonstrated the effects of substituents on meso, α, γ and position of the hydroxyl group on pKa. By considering these parameters, we developed pH sensors working above 11.0 in aqueous medium (ethanol/water 1:1). One of these sensors had a pKa of 12.0 and enabled the measurement of pH up to 13.6. This highly photostable
Highly selective fluorescent OFF–ON thiol probes based on dyads of BODIPY and potent intramolecular electron sink 2,4-dinitrobenzenesulfonyl subunits
作者:Huimin Guo、Yingying Jing、Xiaolin Yuan、Shaomin Ji、Jianzhang Zhao、Xiaohuan Li、Yanyan Kan
DOI:10.1039/c0ob00910e
日期:——
Two highly selective OFFâON green emitting fluorescent thiol probes (1 and 2) with intense absorption in the visible spectrum (molar extinction coefficient ε is up to 73â800 Mâ1 cmâ1 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 OFFâON 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 OFFâON 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.
A BODIPY-based hypoxia-activatable G-quadruplex ligand is developed. Significant hypoxia-dependent decrease in hif-1α, c-myc and bcl-2 expression is observed.