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<p>Coumarin based azo dyes as anion sensors: A spectrophotometric study</p>

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Title Statement <p>Coumarin based azo dyes as anion sensors: A spectrophotometric study</p>
 
Added Entry - Uncontrolled Name Das, Suman ; Jadavpur University
Science and Engineering Research Board, DST, Government of India (SERB No.SR/FT/CS-116/2010); University Grant Commission (UGC), New Delhi, India [F. No. 43-243/2014 (SR), MRP-MAJORCHEM-2013-37991];
 
Uncontrolled Index Term spectroscopy; analytical chemistry
Sensors, Anion sensors, Colorimetric sensors, Fluoride ions, Acetate ions, Azo dyes, 4-Hydroxycoumarins, Coumarins NMR titrations
 
Summary, etc. <p>Two 4-hydroxy coumarin based dyes (<strong>1</strong> and <strong>2</strong>) have been synthesized and their anion detection ability has been studied, for detection of fluoride and acetate ions selectively through the naked eye. On addition of 4 equivalents of fluoride and acetate to the CH<sub>3</sub>CN solution of the receptors <strong>1</strong> and <strong>2,</strong> colour changes from light yellow to light red while the similar addition of other anions like dihydrogen phosphate, chloride, bromide and iodide does not show any significant change in colour under identical experimental conditions. The corresponding UV-vis data show a blue shift of the band of receptor <strong>1</strong> and a red shift of the band of receptor <strong>2</strong> for both fluoride and acetate ions. In fluorescence studies, both the receptors show quenching in the presence of fluoride and acetate ions. Stoichiometry of anionic interaction has been determined from <sup>1</sup>H-NMR titrations and Job’s plot. Theoretical studies using density functional theory and time dependent density functional theory have been explored. Detection of fluoride in aqueous medium by paper strips is also reported.</p>
 
Publication, Distribution, Etc. Indian Journal of Chemistry -Section A (IJCA)
2020-10-19 12:24:06
 
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http://op.niscair.res.in/index.php/IJCA/article/view/18441
 
Data Source Entry Indian Journal of Chemistry -Section A (IJCA); ##issue.vol## 57, ##issue.no## 1 (2018): INDIAN JOURNAL OF CHEMISTRY- SECTION A
 
Language Note en
 
Nonspecific Relationship Entry http://op.niscair.res.in/index.php/IJCA/article/download/18441/55699
http://op.niscair.res.in/index.php/IJCA/article/download/18441/55913
 
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