期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 183, 期 1-2, 页码 190-197出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2006.03.015
关键词
fluorescent probe; pH sensor; acidity constant; borondipyrromethene; spectroscopy
A borondipyrromethene-derived pH indicator (available as methyl ester (1) and sodium salt (2)) for the near-neutral pH range with ultra bright fluorescence in the red spectral region has been synthesized by linking o-chlorophenol to the 3-position of a difluoroboradiazaindacene derivative. Absorption and steady-state and time-resolved fluorescence measurements have been used to study the photophysical properties of the BODIPY-based pH probe. The fluorescence lifetime (3.8 +/- 0.2 ns) and the very high (nearly 1.0) fluorescence quantum yield of dye 1 are not dependent on the solvent. In aqueous solution, the water-soluble compound 2 undergoes a reversible protonation-deprotonation reaction in the near-neutral pH range with a pK(a) of 7.60, which is practically insensitive to low ionic strength. Fluorimetric titrations as a function of pH produce fluorescence emission enhancements at lower pH. (c) 2006 Elsevier B.V. All rights reserved.
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