Detection of Fe2+ in acetonitrile/water mixture by new 8-hydroxyquinolin based sensor through metal displacement mechanism

KARAOGLU K. , Akcay H. T. , Yılmaz İ.

JOURNAL OF MOLECULAR STRUCTURE, vol.1133, pp.492-498, 2017 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 1133
  • Publication Date: 2017
  • Doi Number: 10.1016/j.molstruc.2016.12.049
  • Page Numbers: pp.492-498


A 8-hydroxyquinoline-based (8-HQ) fluorescent ligand (2) was designed and synthesized by condensation of pyridine-2-carboxaldehide with 2-(quinolin-8-yloxy)acetohydrazide (1). Fluorometric titrations with various metal ions in 1:1 M ratio showed that Cu2+ and Ni2+ ions were fully quenched the fluorescence intensity of 2. But, a significant enhancement in the fluorescent intensity was observed when the bound Ni2+ and Cu2+ ions in the 2-Ni and 2-Cu complexes were displaced by Cr3+ and Fe+2 ions, respectively. While 2-Ni exhibited low sensitivity toward Cr3+ ion, the fluorescent titration measurements showed that 2-Cu could be a good "on-off-on" selective and sensitive sensor (S) candidate for determination of Fe2+ in aqueous medium. (C) 2016 Elsevier B.V. All rights reserved.