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首页> 外文期刊>International Journal of Electrochemical Science >Distinctive Routs:Electrochemical and Spectrophotometric Studies and Dissociation Constants Determination of Some Aminopyridine Azo-Dye Derivatives in Aqueous Media
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Distinctive Routs:Electrochemical and Spectrophotometric Studies and Dissociation Constants Determination of Some Aminopyridine Azo-Dye Derivatives in Aqueous Media

机译：独特的溃败：水性介质中某些氨基吡啶偶氮染料衍生物的电化学和分光光度研究及解离常数的测定

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摘要

The electrochemical behavior of some azo compounds derived from 2-amino-3-hydroxypyridine inBritton and Robinson buffer series containing 20% (v/v) ethanol was investigated at the mercuryelectrode using distinctive techniques (DC, CV and DPP) to evaluate the effect of medium andsubstituents on the reduction process and suggestion of the electrode reaction mechanism. Theobtained results indicated that these compounds were reduced undergo an irreversible 4-electronpolarographic wave within the entire pH range leading to the cleavage of the N=N center. The NO2derivative is reduced via a single 8-electron wave and the hydroxylamine group is obtained. The CVdata showed that a single cathodic peak is obtained at all pH representing the reduction of the azocenter as well as the nitro group for azo compound (II). The total number of electrons involved in thereduction process was determined by controlled potential coulometry. The dissociation constantsvalues (pka) of these compounds were determined spectrophotometrically and potentiometrically atroom temperature.
机译：使用独特的技术（DC，CV和DPP）在汞电极上研究了含2-氨基-3-羟基吡啶的Britton和Robinson缓冲液系列（含20％（v / v）乙醇）中衍生的某些偶氮化合物的电化学行为，以评估其效果。介质和取代基对还原过程的影响以及电极反应机理的建议。所得结果表明，这些化合物被还原后在整个pH范围内经历了不可逆的4-电子极谱波，导致了N = N中心的裂解。 NO 2衍生物通过单八电子波还原，得到羟胺基。 CV数据显示，在所有pH下均获得单个阴极峰，代表偶氮化合物（II）的偶氮中心以及硝基的还原。还原过程中涉及的电子总数由可控电库仑法确定。这些化合物的解离常数值（pka）在室温下用分光光度法和电位法测定。

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