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Optical Fluoride Sensor Based on Monomer-Dimer Equilibrium of scandium(III)-octaethylporphyrin in a Plasticized Polymeric Film

Optical Fluoride Sensor Based on Monomer-Dimer Equilibrium of scandium(III)-octaethylporphyrin in a Plasticized Polymeric Film

Youngjea Kang, Jeff W Kampf, Mark E Meyerhoff

Anal Chim Acta. 2007 Aug 29;598(2):295-303.

PMID: 17719905

Abstract:

A fluoride-selective optical sensor based on scandium(III)-octaethylporphyrin (Sc(III)OEP) as an ionophore within a plasticized PVC film is described. The presence of fluoride ion in the aqueous sample phase increases the formation of a difluoro-bridged Sc(III)OEP dimer species in the polymer film. The ability of the Sc(III) porphyrin to form the dimeric structure in the presence of fluoride is confirmed by UV-vis spectroscopy and X-ray crystallography. For more practical sensing applications, a pH chromoionophore (ETH 7075) is added to the plasticized PVC film along with Sc(III)OEP and the observed optical response is based on coextraction of protons with sample phase fluoride to create the dimeric porphyrin and a protonated chromoionophore species. The selectivity pattern observed is F- >> ClO4(-), SCN-, NO3(-) > Br-, Cl-. Only organic salicylate is a significant interferent. Fast and reversible fluoride response is observed over the range of 10(-4) to 10(-2) M fluoride, allowing use of the sensing film in a waveguide configuration for flow-injection measurements.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP13709472	Scandium(III) fluoride		13709-47-2	Price

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