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A water-soluble fluorescent fluoride ion probe based on Alizarin Red S-Al(III) complex.

Authors
  • Sai Sathish, R
  • Ravi Kumar, M
  • Nageswara Rao, G
  • Anil Kumar, K
  • Janardhana, C
Type
Published Article
Journal
Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
Publisher
Elsevier
Publication Date
Feb 01, 2007
Volume
66
Issue
2
Pages
457–461
Identifiers
PMID: 16859979
Source
Medline
License
Unknown

Abstract

A new water-soluble fluorescent fluoride ion signaling system has been developed based on the ligand exchange mechanism in aqueous medium. This procedure is based on the exchange of two Alizarin Red S (ARS) molecules coordinated to Al(III) by fluoride ion without interference from other common anions. The binary complex of ARS with Al(III) provides a sensitive signaling system for fluoride ion in the concentration range from 5x10(-6) to 3x10(-4) M. The ligand exchange reaction of ARS-Al(III) complex with fluoride ion has been investigated by UV-vis and fluorescence spectroscopies combined with the AM1 semi-empirical quantum chemical calculations. The pale orange fluorescence (lambdamax=575 nm) exhibited by the complex upon excitation at 435 nm decreases in intensity with fluoride addition with a detection limit of 0.1 mg L-1.

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