Structural Selectivity of Calix[m]pyrroles[n]furans (m + n = 4) as Ionophores in Ag(I) Ion-Selective Electrodes |
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Authors: | Kyeong Soon Park Sung Ouk Jung Il Yoon Ki-Min Park Jineun Kim Shim Sung Lee Jae Sang Kim |
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Institution: | (1) Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Chinju, 660-701, S. Korea;(2) Research Institute of Natural Sciences, Gyeongsang National University, Chinju, 660-701, S. Korea |
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Abstract: | A series of octamethylcalixm]pyrrolesn]furans (m + n = 4), such astrans-octamethylcalix2]pyrroles2]furans L
1
),cis-octamethylcalix2]pyrroles2]furans (L
2
) and octamethylcalix1]pyrrole3]furans (L
3
) have been studied as sensors in liquid membrane ion-selective electrodes for Ag(I) ion. The electrode based on L
1
, trans-N2O2 porphyrinogen, gave the best results with a wide working concentration range of 1.0 × 10-1 - 1.0 × 105.6 M and a Nernstian slope of 57.0 mV/decade. This electrode exhibited a fast response time of 30 s and high selectivity over a number of mono-, di- and tri-valent cations, with only Tl(I) and Hg(II) ion interferences. The effect of anion excluders on the performance of the membrane electrodes has been also studied. The electrode based on L
1
showed no significant potential changes in the range 2.5 < pH < 7.5. The crystalstructure of L
3
, NO3 porphyrinogen, was determined by single crystal X-ray analysis. The crystallographic analysis of L
3
reveals that its structure is a saddle-shaped 1,3-alternate conformation with enough space to accommodate Ag(I) in the three dimensional cavity. |
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Keywords: | calix[4]pyrroles/furans crystal structure ionophores ion-selective electrodes porphyrinogens silver(I) ion |
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