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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 23, Number 10
BKCSDE 23(10)
October 20, 2002 

Polymeric Acetate-Selective Electrodes Based on meso-( α,α,α,α)-Tetrakis-[(2-arylphenylurea)phenyl]porphyrins: Electronic and pH Effects
Hyo Kyoung Lee, Kiju Song, Hyung Ran Seo, Seungwon Jeon
Polymeric membrane, Urea-functionalized porphyrin, Acetate ion, Ion-selective electrode, Neutral ionophore
Polymeric membrane electrodes for acetate anion based on meso-( α,α,α,α)-5,10,15,20-tetrakis[2-(penta-fluorophenylurea) phenyl]porphyrin I and similar urea-functionalized porphyrins Ⅱ-Ⅳ as neutral ionophores were prepared. The membrane based on porphyrin I exhibits the best potentiometric properties in pH 6.0 rather than pH 7.0: linear stable response over a wide concentration range (6.0 ×10-5-1.0 ×10-2 ) with a slope of -59.6 mV/decade and a detection limit of log[CH3COO- ] = -5.32. Selectivity coefficients obtained from the matched potential method (MPM) in pH 6.0 indicate that interferences of hydrophobic anions are very small for the membranes of porphyrins I and Ⅱ having the strong withdrawing group. The electronic effect of urea-functionalized porphyrins and pH effect of buffer solutions are discussed on the potentiometric response.
1409 - 1412
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