A fluorescent fluoride ion probe based on a self-organized ensemble of 5-hydroxyflavone-Al(III) complex.
In the presence of Al(III) ions, 5-hydroxyflavone (5HF) through a complexation reaction in MeOH, shows dual fluorescence, characterized by a newly developed peak at 554nm upon excitation at 363nm. In this communication, the subsequent ligand exchange reaction of the complex with fluoride ion causing a fluorescence enhancement followed by a decrease in fluorescence intensity involving an intermediate mechanistic pathway, delivering a quantitative estimation route for fluoride ion in the concentration range from 5x10(-5) to 7x10(-4)M, has been reported. The ligand exchange reaction, without interference from other common anions, has been investigated by UV-vis and fluorescence spectroscopies combined with the AM1 semi-empirical self-consistent field quantum chemical calculations within UHF formalism in their ground state.
Sai Sathish
R
R
Department of Chemistry, Sri Sathya Sai University, Prashanthi Nilayam, AP 515134, India.
Goutam Raju
A
A
Nageswara Rao
G
G
Janardhana
C
C
D000535:Aluminum / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D000432:Methanol / Q000737:chemistry; D013050:Spectrometry, Fluorescence
D005419:Flavonoids; D005456:Fluorescent Dyes; C062711:5-hydroxyflavone; D000535:Aluminum; D005459:Fluorides; D000432:Methanol