BODIPY‐Based Oligo(ethylene glycol) Dendrons as Fluorescence Thermometers: When Thermoresponsiveness Meets Intramolecular Electron/Charge Transfer |
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| Authors: | Hua Wang Dr Yongquan Wu Pan Tao Prof?Dr Xing Fan Prof?Dr Gui‐Chao Kuang |
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| Institution: | 1. Department of Polymer Materials, Shanghai University, Nanchen Road 333, 200444, Shanghai (P.R. China);2. Department of Chemistry, Fudan University, Handan Road 220, 200433, Shanghai (P.R. China);3. College of Chemistry and Chemical Engineering, Chongqing University, Shazheng Road 174, 400044, Chongqing (P.R. China) |
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| Abstract: | The temperature‐dependent photophysical properties of a series of 4,4‐difluoro‐4‐bora‐3a,4a‐diaza‐s‐indacene (BODIPY) derivatives with different oligo(ethylene glycol) (OEG) dendrons were investigated. Weak fluorescence emission was observed for these BODIPY derivatives in dilute solution with low viscosity. BDP‐G0 and BDP‐G1‐TEG exhibit a high quantum yield in viscous glycerol solutions, contrary to the moderate and little fluorescence enhancement for BDP‐G1 and BDP‐G2 under the same conditions. The photoinduced electron transfer (PET) may have quenched the fluorescence, as supported by calculation. Interestingly, the thermoresponsive BODIPY derivatives show heat‐induced luminescence enhancement with a high signal‐to‐noise ratio and their emission maxima are dependent on the structures of branched tri(ethylene glycol) moieties. Finally, preliminary studies on the BODIPY derivatives as intracellular fluorescence indicators in living HeLa cells were carried out. |
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| Keywords: | BODIPY dendrimers fluorescence imaging agents thermoresponsiveness |
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