FORMATION OF ANILINE-BONDED CATECHOLS IN AQUEOUS-SOLUTION AND THEIR ELECTROCHEMICAL-BEHAVIOR AT A CARBON FELT ELECTRODE

The oxidized form of catechol (1,2-benzoquinone) reacts with aniline a t neutral pH range and the electroactive 1:1 and 1:2 compounds of cate chol and aniline which exhibit separative reversible redox waves are p roduced and their formal electrode potentials are -0.05 V and -0.23 V, respectively. The 1:1 compound is considered to be an adduct with pin k color and the 1:2 compound is considered to be two anilines substitu ted catechol from the MS data of molecular weight (290) and H-1 and C- 13 NMR data. The 1:2 compound accumulates on the carbon electrode surf ace due to its affinity to the carbon felt electrode and a detection l imit of this compound was found to be 5x10(-9)M.