Self-Assembled Monolayer of a Redox-Active Calix[4]arene:  Voltammetric Recognition of the Ba2+ Ion in Aqueous Media

The Redox-active monolayer of a novel calix[4]arene recognizing redox-inactive ionic species by voltammetry is reported. Calix[4]arene-disulfide-diquinone, which is not only redox-active but is also a highly selective ionophore for the Ba2+ ion, spontaneously forms a stable and dense monolayer film...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2001-08, Vol.73 (16), p.3975-3980
Main Authors: Chung, Taek Dong, Park, Jongseo, Kim, Jandee, Lim, Hyunchang, Choi, Mi-Jung, Kim, Joo Ryun, Chang, Suk-Kyu, Kim, Hasuck
Format: Article
Language:English
Subjects:
Chemical bonds
Chemistry
Exact sciences and technology
General and physical chemistry
Ions
Sensors
Solid-liquid interface
Surface physical chemistry
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Summary:The Redox-active monolayer of a novel calix[4]arene recognizing redox-inactive ionic species by voltammetry is reported. Calix[4]arene-disulfide-diquinone, which is not only redox-active but is also a highly selective ionophore for the Ba2+ ion, spontaneously forms a stable and dense monolayer film on gold. The redox-active calixarene monolayer selectively recognizes Ba2+ ion in aqueous media, and the voltammetric signals are proportional to the ionic concentration. A new voltammetric peak can be detected by square-wave voltammetry upon adding a dilute solution containing Ba2+ ion having a concentration as low as 1.0 × 10-6 M. The Langmuir plot (1/i p vs 1/[Ba2+]) shows a linear slope in the range from 1.0 × 10-6 M to 1.0 × 10-4 M. This modified electrode does not show any significant interference from alkali and alkaline earth metal ions except for Sr2+ and Ca2+. Only 100- and 500-fold concentrations of Sr2+ and Ca2+ ions, respectively, can lead to voltammetric responses comparable to that of Ba2+.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac001050p