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      https://www.ias.ac.in/article/fulltext/jcsc/132/0156

    • Keywords

       

      Chemosensor; Anions; Oxacalix[4]arene; Fluorescence; DFT calculations

    • Abstract

       

      A new anthraquinone appended oxacalix[4]arene (DAQOC) has been synthesized and characterized by different 1H NMR, IR, ESI-MS and 13C NMR spectroscopic techniques. This compound was explored for its sensing abilities towards various anions. DAQOC showed selective anion sensing behaviour towards F- ions which was supported by absorption as well as emission studies. Among other anions, only in the presence of F- ions, a quenching in the fluorescence emission of over 79% was observed due to changesin the intermolecular charge transfer (ICT) process. DAQOC exhibited high selectivity and good sensitivity toward F- ions in the presence of competing ions and the detection limit was found to be 1.23 lM. -H NMR titration displays that the peak corresponding to –NH protons (at 12.91 ppm) disappears upon interaction with F-, suggesting that the sensing mechanism follows the deprotonation route. The geometrical features of F- bound oxacalixarene species were modelled by the Density Functional Theory (DFT) and NCIPlot calculations. The findings suggested that the appended substituents including nitro groups and anthraquinone can make the calix[4]arene ring electron deficient and thereby more susceptible for F- ions. Moreover, this present chemosensor has been applied for recognition of F- ions from waste water samples which is of directpractical relevance.

    • Author Affiliations

       

      MANOJ VORA1 ANITA KONGOR1 MANTHAN PANCHAL1 MOHD ATHAR2 ASHUKUMAR VERMA1 FALAK PANJWANI1 P C JHA3 VINOD JAIN1

      1. Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad, Gujarat 380 009, India
      2. CCG@CUG, School of Chemical Sciences, Central University of Gujarat, Gandhinagar, Gujarat 382 030, India
      3. CCG@CUG, Centre for Applied Chemistry, Central University of Gujarat, Gandhinagar, Gujarat 382 030, India
    • Dates

       
  • Journal of Chemical Sciences | News

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