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Fluoride ion detection by 8-hydroxyquinoline–Zr(IV)–EDTA complex by R. Sai Sathish; U. Sujith; G. Nageswara Rao; C. Janardhana is a Chemistry article available to read on EtoBox.

What is Fluoride ion detection by 8-hydroxyquinoline–Zr(IV)–EDTA complex about?

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 × 10 -7 M to 8 × 10 -4 M. The green fluorescence (λ 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.

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Author

R. Sai Sathish; U. Sujith; G. Nageswara Rao; C. Janardhana

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Pergamon Press Ltd.; Elsevier BV (ISSN 1386-1425)

Published

2006

Language

EN

Field

Chemistry (Physical Sciences)