Colorimetric and fluorescence sensing of fluoride anions with potential salicylaldimine based schiff base receptors

Salicylaldimine based schiff base receptors with different substituents showing fluorescent enhancement in the presence of fluoride anion was visualized through naked eye as well as by change in spectral properties (UV–vis and fluorescent techniques). The reason for such fluorescence enhancement may...

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Bibliographic Details
Published in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2010-03, Vol.75 (3), p.1146-1151
Main Authors: Sivakumar, Radhakrishnan, Reena, Vijayaragavan, Ananthi, Nallamuthu, Babu, Muthiya, Anandan, Sambandam, Velmathi, Sivan
Format: Article
Language:English
Subjects:
Anions
Fluorescence enhancement
Fluoride sensors
Schiff base
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Summary:Salicylaldimine based schiff base receptors with different substituents showing fluorescent enhancement in the presence of fluoride anion was visualized through naked eye as well as by change in spectral properties (UV–vis and fluorescent techniques). The reason for such fluorescence enhancement may be due to hydrogen bond interaction between receptor recognition site and fluoride anion. Such a hydrogen bond interaction creates a six-membered transition state, which avoids quenching processes. To support this, fluorescence enhancement factor (FEF) was calculated and it was found to be more (FEF = 652) for –NO 2 substituted receptor compared to other receptors.
ISSN:1386-1425
DOI:10.1016/j.saa.2009.12.077