A self-organized ensemble of fluorescent 3-hydroxyflavone-Al (III) complex as sensor for fluoride and acetate ions

Aluminum chloride addition results in a self-organized TURN-ON fluorescence of 3-hydroxyflavone (3HF) by a complexation reaction in MeOH and subsequent ligand exchange reaction with fluoride or acetate ions causes a fluorescence TURN-OFF of this complex, delivering a quantitative estimation route fo...

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Bibliographic Details
Published in:Journal of fluorescence 2007-01, Vol.17 (1), p.1-5
Main Authors: Sathish, Sai, Narayan, Govindh, Rao, Nageswara, Janardhana, Chelli
Format: Article
Language:English
Subjects:
Acetates - chemistry
Aluminum - chemistry
Flavones - chemistry
Fluorides - chemistry
Ions - analysis
Ligands
Methanol - chemistry
Molecular Structure
Spectrometry, Fluorescence
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Summary:Aluminum chloride addition results in a self-organized TURN-ON fluorescence of 3-hydroxyflavone (3HF) by a complexation reaction in MeOH and subsequent ligand exchange reaction with fluoride or acetate ions causes a fluorescence TURN-OFF of this complex, delivering a quantitative estimation route for fluoride and acetate ions. The ternary complex of 3HF with Al (III), a hard acid provides for a sensitive signalling system for fluoride ion, a hard base in the concentration range from 6 muM to 50 mM by a concerted co-ordination of fluoride ion involving an intermediate mechanistic pathway, while the complex is sensitive to acetate addition between 0-68 muM. The ligand exchange reaction of Al (3HF)(2) complex by fluoride or acetate ion, without interference from other common anions, has been investigated by UV-visible and fluorescence spetroscopies. The structure of the in-situ intermediate isolated at higher Al (3HF)(2) complex and acetate concentrations was inferred from the FT-IR spectrum and ESI-MS of the sample.
ISSN:1053-0509
1573-4994
DOI:10.1007/s10895-006-0137-1