Electrochemical Behavior of Azobenzene-4,4'-disulfonamide at Pyrolytic Graphite Electrode.
作者:R. N. Goyal、Amit Kumar Srivastava
DOI:10.1246/bcsj.66.205
日期:——
The electrochemical reduction of azobenzene-4,4′-disulfonamide (1), an oxidation product of sulfanilamide, has been studied at Pyrolytic graphite electrode, over a wide pH range of 3.0 to 10.6 in the Britton Robinson buffers, by electrochemical and spectroscopic techniques. Under cyclic voltammetric conditions the 2e−, 2H+ reduction of this compound was found to give hydrazobenzene-4,4′-disulfonamide which has been characterised using IR, mp, mass and NMR spectra. Under controlled potential electrolysis, the presence of two electron withdrawing –SO2NH2 groups was found to cause the slow disproportionation [K′ = 3.29 × 10−3 s−1] of the hydrazo compound and sulfanilamide has been found as the major product of reduction. A plausible mechanism for the ECE reduction of 1 is suggested.
通过电化学和光谱技术,在热解石墨电极上,在 Britton Robinson 缓冲液中,在 3.0 至 10.6 的宽 pH 范围内,研究了偶氮苯-4,4'-二磺酰胺 (1)(磺胺的氧化产物)的电化学还原。在循环伏安条件下,该化合物发生 2e−, 2H+ 还原反应,生成肼苯-4,4'-二磺酰胺,并使用红外、熔点、质谱和核磁共振谱对其进行了表征。在受控电位电解下,发现两个吸电子基团 –SO2NH2 的存在会导致亚肼基化合物缓慢歧化 [K′ = 3.29 × 10−3 s−1],并且发现磺胺是还原的主要产物。提出了一种使 ECE 减少 1 的合理机制。