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Photophysical properties of an on/off fluorescent pH indicator excitable with visible light based on a borondipyrromethene-linked phenol

Paper ID Volume ID Publish Year Pages File Format Full-Text
28457 44075 2006 8 PDF Available
Title
Photophysical properties of an on/off fluorescent pH indicator excitable with visible light based on a borondipyrromethene-linked phenol
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 pKa 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.

Keywords
Fluorescent probe; PH sensor; Acidity constant; Borondipyrromethene; Spectroscopy
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Photophysical properties of an on/off fluorescent pH indicator excitable with visible light based on a borondipyrromethene-linked phenol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 183, Issues 1–2, 30 September 2006, Pages 190–197
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us