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Electrochemistry of dopamine at the polarised liquid|liquid interface facilitated by an homo-oxo-calix[3]arene ionophore

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Authors
Herzog, G.
McMahon, B.
Lefoix, M.
Mullins, N.
Collins, C.
Moynihan, H.
Moynihan, H.
Arrigan, Damien
Date
2008
Type
Journal Article

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Herzog, G. and McMahon, B. and Lefoix, M. and Mullins, N. and Collins, C. and Moynihan, H. and Moynihan, H. et al. 2008. Electrochemistry of dopamine at the polarised liquid|liquid interface facilitated by an homo-oxo-calix[3]arene ionophore. Electroanalytical Chemistry. 622 (1): pp. 109-114.
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Electroanalytical Chemistry
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Abstract

The homo-oxo-calix[3]arene-facilitated electrochemistry of dopamine at the polarised liquid|liquid interface is presented. Cyclic voltammetry indicated that the dopamine: homo-oxo-calix[3]arene complex formed at the interface between water and 1,2-dichloroethane had a 1:2 stoichiometry, which was confirmed by 1H NMR titration. The electrochemically-determined association constants for the homo-oxocalix[ 3]arene complexes with dopamine (log b 8.3), Na+ (8.0) and K+ (7.5) showed that the ionophore was more selective for dopamine over the two alkali metal cations than the dibenzo-18-crown-6 ionophore. Square wave voltammetry was employed for assessment of low concentration measurements, with a limit of detection of 3.8 lM dopamine achieved. These results show that oxo-calixarene-based ionophores are useful reagents for the detection of dopamine at the interface between two immiscible electrolyte solutions.