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

Kaan Karaoglu; H. Turker Akcay; Ismail Yilmaz

doi:10.1016/j.molstruc.2016.12.049

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

Kaan Karaoglu^*, H. Turker Akcay, Ismail Yilmaz

^*Corresponding author for this work

Department of Chemistry

Recep Tayyip Erdogan University

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	492-498
Number of pages	7
Journal	Journal of Molecular Structure
Volume	1133
DOIs	https://doi.org/10.1016/j.molstruc.2016.12.049
Publication status	Published - 5 Apr 2017

Bibliographical note

Publisher Copyright:
© 2016 Elsevier B.V.

Keywords

8-Hydroxyquinoline
DFT
Metal displacement
Metal ion sensing

Access to Document

10.1016/j.molstruc.2016.12.049

Cite this

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

abstract = "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 {\textquoteleft}{\textquoteleft}on-off-on{\textquoteright}{\textquoteright} selective and sensitive sensor (S) candidate for determination of Fe2+ in aqueous medium.",

keywords = "8-Hydroxyquinoline, DFT, Metal displacement, Metal ion sensing",

author = "Kaan Karaoglu and {Turker Akcay}, H. and Ismail Yilmaz",

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doi = "10.1016/j.molstruc.2016.12.049",

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AU - Karaoglu, Kaan

AU - Turker Akcay, H.

AU - Yilmaz, Ismail

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AB - 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.

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