Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 425, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2021.113723
Keywords
Sugar-modified; Fluorescent; Aqueous medium; DFT calculation; Au3+ ions
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Funding
- Technical Education Quality Improvement Programme of the Government of India (TEQIP)
- CSIR-HRDG [02(0442)/21/EMR-II]
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The sugar-modified simple fluorometric sensors 1 and 2 for detection of Au3+ in the aqueous acetonitrile have remarkable selectivity and excellent sensitivity.
The sugar-modified simple fluorometric sensors 1 and 2 for detection of Au3+ in the aqueous acetonitrile have been reported. The sensors are double-responsive (absorbance and fluorescence) selective Au3+ sensors in CH3CN-H2O (1:1, v/v). Both the sensors exhibited remarkable selectivity and excellent sensitivity (limit of detection values are 0.53 mu M for 1 and 0.83 mu M for 2). The stoichiometry of each complex was established by Job's plot and supported by the ESI-mass spectrum of the complex. Finally, the coordination mode of each sensor with Au3+ ions was supported by DFT calculations in CH3CN-H2O (1:1, v/v) medium. The energy-optimized structures of 1-Au3+ and 2-Au3+ suggested that sensors 1 and 2 followed different binding modes with Au3+ ions in the aqueous acetonitrile medium, which account for the ESI-MS spectra of the complexes. Interestingly, we observed that fluorometric sugar derivatives 1 and 2 did not show any specific selectivity towards metal ions in CH3CN.
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