A CYCLIC VOLTAMMETRIC STUDY OF THE AQUEOUS ELECTROCHEMISTRY OF SOME QUINONES
A CYCLIC VOLTAMMETRIC STUDY OF THE AQUEOUS ELECTROCHEMISTRY OF SOME QUINONES
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DOI：
10.1016/0013-4686(85)80051-7
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发表时间：
1985-01-01
影响因子：
6.6
通讯作者：
RITCHIE, IM
中科院分区：
文献类型：
--
作者：
BAILEY, SI;RITCHIE, IM
用循环伏安法研究了几种醌类和两种羟基醌类的水溶液电化学反应。选择醌来代表各种结构类型，其中一些是磺化的，以使它们充分溶于水。通过测量半波电位作为pH的函数，为每种化合物构建了电位pH图。在某些情况下，用分光光度法测定的pkvalue值来补充数据。在1,4-苯醌的特殊情况下，得到的电位pH图的结果与文献中报道的同一体系的平衡测量结果非常吻合。除羟基醌外，其他醌类化合物的电位pH图的一般形状与1,4-苯并醌相似。对于每种化合物，报告了潜在的pH斜率和pka值。半波电位的测量不仅可以在缓冲溶液中进行，也可以在无缓冲溶液中进行。报告了两种测量方法之间的差异。大多数醌类化合物在高ph下分解，讨论了其分解过程。
The aqueous electrochemistry of a number of quinones and two hydroxyquinones was studied using cyclic voltammetry. The quinones were chosen to represent a variety of structural types, and several were sulphonated in order to make them sufficiently water soluble. From measurements of the half-wave potential as a function of pH, potentialpH diagrams were constructed for each of the compounds. In some cases, the data were supplemented by pKavalues which were determined spectrophotometrically. In the particular case of 1,4-benzoquinone, it was shown that the results obtained for the potentialpH diagram agreed very closely with equilibrium measurements which had been reported in the literature for the same system. The general shape of the potentialpH diagrams for the other quinones, but not hydroxyquinones, was similar to that of 1,4-benzoquione. For each compound, values of the potentialpH slopes and pKas are reported. Half-wave potential measurements were not only made in buffered solutions, but also unbuffered solutions. Differences between the two type of measurements are reported. Most of the quinones decomposed at high pH. The course of the decomposition is discussed.