Electrochemical behavior of some anthraquinone (Aq) derivatives were investigated in acetonitrile (AN), N,N-dimethyl formamide (DMF) and dimethylsulfoxide (DMSO) by cyclic voltammetry (CV), quantum mechanics and statistical methods. A reasonable correlation between the computational and experimental standard reduction potential (E°) for electron transfer was obtained. It was concluded that the first step reduction potential, E°1 in acetonitrile, increases with hydrogen bonding, aromaticity and HOMO energy and decreases with size and polarity of anthraquinone. Trend of average values for E°1 in three solvents is AN AUTHOR KEYWORDS: Anthraquinones; Cyclic voltammetry; Quantitative structure-property relationship (QSPR); Self consistent reaction field; Solvent effect PUBLISHER: Electrochemical Science Group
New PVC based polymeric membrane electrodes (PME) and coated glassy carbon electrodes (CGCE) based on synthesized Schiff base complexes of Co(III); [Co(Salen)(PBu3)2]ClO4, [Co(Me 2Salen)(PBu3)2]ClO4, [Co(Salen)(PBu3)H2O]ClO4; as anion carriers for potentiometric determination of ClO4? were studied. The PME and also CGCE electrodes prepared with [Co(Me2Salen)(PBu 3)2]ClO4 showed excellent response characteristics to perchlorate ions. The electrodes exhibited Nernstian responses to ClO4? ions over a wide concentration range with low detection limits (1.0 × 10?6 mol L?1 for PME and 9.0 × 10?7 mol L?1 for CGCE). The electrodes possess fast response time, satisfactory reproducibility, appropriate lifetime and, most importantly, good selectivity toward ClO4? relative to a variety of other common inorganic anions. The potentiometric response of the electrodes is independent of the pH in the pH range 2.5-8.5. The proposed sensors were used in potentiometric determination of perchlorate ions in mineral water and urine samples. The interaction of the ionophore with perchlorate ions was shown by UV/Vis spectroscopy.
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