Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1169666 | Analytica Chimica Acta | 2008 | 8 Pages |
Abstract
We have synthesized a bis(terthiophene)-appended uranyl-salophen complex, comprising N,Nâ²-bis[4-(5,2â²:5â²,2â³-terthiophen-3â²-yl)salicylidene]-1,2-ethanediamine-uranyl complexes (TUS), and used it as a monomer for the electrochemical polymerizations (poly-TUS) on glassy carbon surfaces to prepare functionalized conducting polymer (CP) films. The poly-TUS films prepared from propylene carbonate/0.1Â M tetrabutyl ammonium perchlorate (TBAP) on a glassy carbon electrode have both the functionality of ion-to-electron transducers (solid contact) and Lewis-acidic binding sites for a monohydrogen phosphate (MHP) ion-selective electrode (ISE). The CP/poly-TUS sensor showed a linear range between 1.0Â ÃÂ 10â1 and 1.0Â ÃÂ 10â4.5Â M with a near-Nernstian behavior (â30.4Â mVÂ decadeâ1) at a pH of 8.2. The detection limit of the electrode was 10â5.0Â M and the response time was improved (<10Â s) compared to that of conventional ISEs (<20Â s). For comparison, a conventional ISE (with an internal aqueous solution) based on a TUS monomer/o-nitrophenyl octylether (o-NPOE)/polyvinyl chloride (PVC) liquid membrane with or without tridodecylmethylammonium chloride (TDMACl) as an additive was also constructed and its performance as an MHP-ISE were studied. The superior selectivity and sensitivity of the CP/poly-TUS sensor enabled the direct measurement of MHP in a wide variety of applications.
Keywords
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Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Junghwan Kim, Dong Min Kang, Sung Chul Shin, Myong Yong Choi, Jineun Kim, Shim Sung Lee, Jae Sang Kim,