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A unique sensitive and highly selective fluorescent naphthodiaza-crown macrocyclic ligand chemosensor for Hg2+ in water

Ghanbari, B ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1007/s10895-017-2075-5
  3. Publisher: Springer New York LLC , 2017
  4. Abstract:
  5. The noticeable enhancement in fluorescence emission of O2N2-donor naphthodiaza-crown macrocyclic ligand (L) in the presence of Hg2+ was observed in which the fluorescence quantum yield of free ligand L as well as L/Hg2+ complex were found to be as 0.29 and 0.49, respectively. The observed ultra-low limit of detection (LOD) for Hg2+ by L was determined as low as 1.0 × 10−11 M in water. A 1:1 stoichiometry was also established for L/Hg2+ together with a binding constant KBH = 66,543 by employing fluorescence spectrophotometry. The competition experiments on L/Hg2+ demonstrated highly selective detection of Hg2+ in the presence of the library cations. A two path mechanism for detection of metal ion in terms of coordination of metal ion to L and/or the formation of counter ion was proposed by using of 1H NMR and fluorescence spectroscopy. [Figure not available: see fulltext.]. © 2017, Springer Science+Business Media New York
  6. Keywords:
  7. Aqueous solution ; Binding constant ; Fluorescence ; Hg2+ Chemosensor ; Macrocyclic ligand ; Bins ; Fluorescence spectroscopy ; Ligands ; Metal ions ; Metals ; Physiology ; Solutions ; Chemosensor ; Fluorescence emission ; Fluorescence quantum yield ; Fluorescence spectrophotometry ; Macro-cyclic ligands ; Naphthadiaza-crown ; Selective detection ; Fluorescence
  8. Source: Journal of Fluorescence ; Volume 27, Issue 4 , 2017 , Pages 1385-1398 ; 10530509 (ISSN)
  9. URL: https://link.springer.com/article/10.1007%2Fs10895-017-2075-5