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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 25, Number 10
BKCSDE 25(10)
October 20, 2004 

Improved Thiocyanate-Selective Electrode Based on Tetra(trimethylphenyl)-porphyrinato Manganese(III) Chloride: The Electronic and pH Effects
Hyung Ran Seo, Hyo Kyoung Lee, Seungwon Jeon*
Ion-selective electrodes, Manganese porphyrins, Potentiometric determination, Polymeric membrane, Thiocyanate ion
The thiocyanate-selective PVC membrane electrodes based on 5,10,15,20-tetrakis(2,4,6-trimethylphenyl)-porphyrinatomanganese(III) chloride [Mn(TMP)Cl] and 5,10,15,20-tetrakis(2,6-dichlorophenyl)porphyrinatomanganese(III) chloride [Mn(Cl8TPP)Cl] as ion carriers were investigated. The effect of ionophores, membrane compositions, plasticizers, and solution pHs on the response characteristics were studied. The Mn(TMP)Cl as an ionophore shows the best potentiometric sensitivity with a slope of -58.7 mV/decade and a detection limit of log[SCN?] = -6.90, and selectivity for thiocyanate over strong hydrophobic interfering anions such as ClO4 ? and salicylate. The potentiometric response is affected by the electronic effect of the substituents and solution pHs. The presence of substituents with electron donating and more liphophilic characters around the ligated metal center produces an improved response toward SCN?.
1484 - 1488
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