Fluoride ion detection by 8-hydroxyquinoline-Zr(IV)-EDTA complex

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
R Sai SathishC Janardhana

Abstract

A simple fluorescent detection based on the ligand exchange mechanism is proposed for the fluoride ion in aqueous media. This procedure is based on the exchange of 8-hydroxyquinoline (oxine) coordinated to Zr(IV) by fluoride ion without interference from other common anions. The ternary complex of oxine with [Zr(H(2)O)(2)EDTA].2H(2)O formed by replacing two water molecules in aqueous solution provides a sensitive signalling system for fluoride ion in the concentration range from 6 x 10(-7)M to 8 x 10(-4)M. The green fluorescence (lambda(max)=532 nm) exhibited by the complex upon excitation at 247 nm decreases in intensity with fluoride addition with a detection limit of 12 ppb. The complexation reaction between oxine and Zr(IV)-EDTA and the ligand exchange reaction with fluoride ion has been investigated by UV-vis and fluorescence spectroscopies combined with the PM3 semi-empirical quantum chemical calculations. Job's method of continuous variation and the molar ratio method ascertain a 1:1 stoichiometry composition of the chelate in aqueous media.

References

Sep 1, 1990·British Journal of Clinical Pharmacology·C J Bulpitt, A E Fletcher
Jul 24, 2003·Chemical Society Reviews·Chomchai Suksai, Thawatchai Tuntulani

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Citations

May 29, 2007·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·R Sai SathishC Janardhana
Jul 25, 2006·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·R Sai SathishC Janardhana
Jun 27, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Ankita DasGoutam Kumar Lahiri
Mar 26, 2014·Chemical Reviews·Ying ZhouJuyoung Yoon
May 14, 2009·Chemical Communications : Chem Comm·Massimo Cametti, Kari Rissanen
Dec 14, 2016·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Yue WangZhiqiang Zhang

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