K. Chiu, T. Su, Jia Li
Jan 15, 2005
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Influential Citations
125
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Quality indicators
Journal
Journal of Electroanalytical Chemistry
Abstract
Abstract A series of amino-substituted triphenylamine derivatives have been synthesized and the electrochemical and spectral characteristics has been investigated. Triphenylamine is also used as a reference. p -Amino-triphenylamine ( 1 ) showed two reversible redox couples at E 1/2 = 0.59 and 1.09 V in CH 2 Cl 2 . The stable cation radical 1 + was generated electrochemically and exhibited strong bands in the visible region as determined in situ by UV/Vis/NIR spectroelectrochemical methods. The second oxidation product 1 2+ could be generated electrochemically, but was not very stable after long time electrolysis at applied potentials higher than 1.15 V. p , p ′-Diamino-triphenylamine ( 2 ), p -methyl- p ′, p ″-diamino-triphenylamine ( 2a ), p -methoxy- p ′, p ″-diamino-triphenylamine ( 2 b ) and p , p ′, p ″-triamino-triphenylamine ( 3 ) are more stable in CH 3 CN than in CH 2 Cl 2 during cyclic scans at oxidation potentials. The oxidation potentials of the various amino-substituted TPA derivatives and the stability of the oxidized products are solvent-dependent and relate to the molecular structures.