The rate of reaction between Leuco Bindschedler’s Green (BGH) and some p-benzoquinone derivatives (Q’s) in acetone was followed spectrophotometrically by means of the stopped-flow technique. The reaction was found to proceed reversibly. The rate data and the activation parameters for the forward and backward reactions were estimated. The rates were susceptible to the oxidation–reduction potentials of the Q’s. The absorption spectra observed at low temperatures indicated that three kinds of intermediates were involved. Radicals formed during the reaction were detected by the ESR method. The results have been discussed in relation to those previously obtained for systems involving Leuco Crystal Violet (LCV) and Leuco Malachite Green (LMG).
通过停流技术,对 Leuco Bindschedler's Green(BGH)和一些
对苯醌衍
生物(Q's)在
丙酮中的反应速率进行了分光光度法测定。结果发现反应是可逆进行的。估算了正向和逆向反应的速率数据和活化参数。速率易受 Q 的氧化还原电位的影响。在低温下观察到的吸收光谱表明,其中涉及三种中间产物。通过 ESR 方法检测了反应过程中形成的自由基。讨论的结果与之前在涉及褐晶紫(LCV)和褐
孔雀石绿(LMG)的体系中获得的结果有关。