A water-soluble fluorescent fluoride ion probe based on Alizarin Red S-Al(III) complex.
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.
Sai Sathish
R
R
Department of Chemistry, Sri Sathya Sai Institute of Higher Learning, Prashanthi Nilayam, AP 515134, India.
Ravi Kumar
M
M
Nageswara Rao
G
G
Anil Kumar
K
K
Janardhana
C
C
D000535:Aluminum / Q000737:chemistry*; D000880:Anthraquinones / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D012995:Solubility; D013050:Spectrometry, Fluorescence; D014867:Water / Q000737:chemistry
D000880:Anthraquinones; D005456:Fluorescent Dyes; D014867:Water; C004468:Alizarin Red S; D000535:Aluminum; D005459:Fluorides