A novel “off–on” colorimetric and fluorescent rhodamine-based pH chemosensor for extreme acidity

[Display omitted] •We designed a novel “off–on” colorimetric and fluorescent pH chemosensor.•The probe displayed strong fluorescence and absorption enhancement response to strongly acidic pH.•The optical property response to pH is reversible, without interference from common metal ions and environme...

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Bibliographic Details
Published in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2015-04, Vol.140, p.489-494
Main Authors: Tan, Jia-Lian, Zhang, Mu-Xue, Zhang, Fang, Yang, Ting-Ting, Liu, Yu, Li, Zhu-Bo, Zuo, Hua
Format: Article
Language:English
Subjects:
E. coli
Fluorescence chemosensor
Imaging
Rhodamine analogue
Strong acidity
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Summary:[Display omitted] •We designed a novel “off–on” colorimetric and fluorescent pH chemosensor.•The probe displayed strong fluorescence and absorption enhancement response to strongly acidic pH.•The optical property response to pH is reversible, without interference from common metal ions and environmental factors.•The probe can be used as the indictors for the extreme acidity in E. coli. A novel “off–on” colorimetric and fluorescent rhodamine analogue was synthesized and characterized, and used to monitor extreme acidity (below pH 3.5) via the photophysical response to pH. The colorless spirocyclic structure at high pH (pH⩾7.0) opened to the colored and highly fluorescent form at very low pH (pH
ISSN:1386-1425
DOI:10.1016/j.saa.2014.12.110