Komplexcolorimetrie Seltener Erden

An Electrode Mechanism for the Electrochemical Reduction of M-dinitrobenzene

“…Pearson (11) polarographically examined a series of dinitro aromatic compounds and concluded that these compounds reduced in two separate stages with each stage equivalent to a four-electron reduction. Such a reaction path has also been postulated by other workers on the basis of polarographic evidence (7)(8)(9)(10)(11). Ehlers and Sease (6) used a combination of potentiostatic reduction and polarographic techniques to elucidate the reaction path for the reduction of m-dinitrobenzene and other polynitro aromatic compounds.…”

“…Repeated efforts to electrolyze to 100% of the first step in the reduction failed to give all 3-nitrophenylhydroxylamine. Discussion From the data listed above and from work of other investigators (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11), a reaction path for the reduction of m-dinitrobenzene is well established. Above pH of 2, the reduction takes place in two steps, polarographically and coulometrically, each wave is of equal height and is equivalent to four electrons.…”

“…The purification of the LiC1-KC1 eutectic, the electrochemical cell and reference electrodes, and other aspects of the experimental procedure were as described in a previous publication (9). Solutions of zirconium and hafnium were prepared by anodic dissolution of the metal rods using a constant current source (about 10 ma/cm2).…”