Two new β-diketone-boron difluoride based near-infrared fluorescent probes 1 and 2 which exhibit polarity sensitivity have been designed and synthesized. Probes 1 and 2 are composed of β-diketone-boron difluoride moiety...
Nitric oxide (NO) is an important signal molecule in biological systems and correlated with many physiological processes and pathological diseases. To date, numerous fluorescent probes based on o-diamino aromatics have...
A new excited‐state intramolecular proton transfer based near‐infrared emission and polarity‐sensitive fluorescent probe (E)‐3‐((E)‐2‐chloro‐3‐((E)‐2‐(3‐ethyl‐1,1‐dimethyl‐1H‐benzo[e]indol‐2(3H)‐ylidene)ethylidene)cyclohex‐1‐en‐1‐yl)‐1‐(2‐hydroxyphenyl)prop‐2‐en‐1‐one (M‐NA) was developed. This probe consisted of benzomerocyanine unit and o‐hydroxyacetophenone unit. In high‐polar solvent, M‐NA displayed higher fluorescence and longer emission wavelength. Theoretical calculations data showed that M‐NA had larger emission oscillator strength and lower non‐radiative decay in high polarity media, corresponding with the fluorescence character. Further experiments verified that M‐NA possessed excellent selectivity and stability, and could further quantify the accurate polarity as well as the water content of binary mixed solvent.
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