• ANITA KONGOR

      Articles written in Journal of Chemical Sciences

    • A highly selective anthraquinone appended oxacalixarene receptor for fluorescent ICT sensing of F- ions: an experimental and computational study

      MANOJ VORA ANITA KONGOR MANTHAN PANCHAL MOHD ATHAR ASHUKUMAR VERMA FALAK PANJWANI P C JHA VINOD JAIN

      More Details Abstract Fulltext PDF

      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.

  • Journal of Chemical Sciences | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.