Journal
TETRAHEDRON LETTERS
Volume 54, Issue 29, Pages 3822-3825Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2013.05.034
Keywords
Hydrogen bond; Fluorescence chemosensor; Coumarin; pH detection
Categories
Funding
- National Natural Science Foundation of China [21074054, 51173078, 21204066]
- Commonweal Project of Science and Technology Department of Zhejiang Province [2012C23030]
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Two coumarin-type fluorescent sensors were synthesized and their fluorescence response to pH value was investigated. The fluorescence intensity of sensor 3 and sensor 4 is obviously enhanced along with the increase of pH from 7 to 12 and the reduction of pH value from 8 to 1, respectively. Possible mechanism for these fluorescence recovery systems is proposed. Intramolecular hydrogen bond could be formed under different condition, which blocks electron transferring route from nitrogen atom to fluorophore. The blue fluorescence color change of the two sensory systems could be directly detected by naked eyes under UV-lamp for pH values. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.
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