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Title: Photophysical properties of an on/off fluorescent pH indicator excitable with visible light based on a borondipyrromethene-linked phenol
Authors: Qin, Wenwu ×
Baruah, Mukulesh
De Borggraeve, Wim
Boens, Noël #
Issue Date: Sep-2006
Publisher: Elsevier Sequoia
Series Title: Journal of Photochemistry and Photobiology A, Chemistry vol:183 issue:1-2 pages:190-197
Abstract: 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.
ISSN: 1010-6030
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Design and Synthesis
Molecular Imaging and Photonics
× corresponding author
# (joint) last author

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