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

Sai Sathish R, Ravi Kumar M, Nageswara Rao G, Anil Kumar K, Janardhana C

Department of Chemistry, Sri Sathya Sai Institute of Higher Learning, Prashanthi Nilayam, AP 515134, India.

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.

Published 8 January 2007 in Spectrochim Acta A Mol Biomol Spectrosc, 66(2): 457-61.
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